Kirchhoff's Laws questions

In the electric network shown, ..........

1. A the current (I) = 3 A, and its direction is from a to c
2. B the current (I) = 3 A, and its direction is from c to a
3. C the current (I) = 5 A, and its direction is from a to c
4. D the current (I) = 5 A, and its direction is from c to a

In the opposite figure, if $I_1 = I_2 = I_3 = I_4 = I_5$, then $I_6$ equals ..........

1. A $I_1$
2. B $2 I_1$
3. C $3 I_1$
4. D $4 I_1$

In the figure shown, the value of I is ..........

1. A 2 A
2. B 4 A
3. C 6 A
4. D 12 A

The opposite figure represents part of an electric circuit, so the value of I is ..........

1. A 19 A
2. B 23 A
3. C 27 A
4. D 31 A

The opposite figure represents part of an electric circuit, so the value of I is ..........

1. A 2 A
2. B 4 A
3. C 6 A
4. D 8 A

The opposite figure represents part of an electric circuit, so the value of I is ..........

1. A 2.5 A
2. B 3.5 A
3. C 6.5 A
4. D 7.5 A

In the opposite figure:
the current $I_1$ is ..........

1. A -2.5 A
2. B 3.5 A
3. C 4 A
4. D 6 A

In the opposite figure:
the current $I_2$ is ..........

1. A -2.5 A
2. B 3.5 A
3. C 4 A
4. D 6 A

A metal ring is connected in an electric circuit and currents flow through it as in the opposite figure, so:
the current $I_1$ is ..........

1. A 0
2. B 4 A
3. C 9 A
4. D 13 A

A metal ring is connected in an electric circuit and currents flow through it as in the opposite figure, so:
the current $I_2$ is ..........

1. A 2 A
2. B 4 A
3. C 9 A
4. D 12 A

In the opposite figure, if the potentials of points B, C, D are: potential of B = 4 V, potential of C = 10 V and potential of D = 6 V, then the potential of point A equals ..........

1. A 4 V
2. B 8 V
3. C 12 V
4. D 16 V

The opposite figure is part of an electric circuit showing the potential of some points, so the current flowing between the two points (x), (y) shown on the figure equals ..........

1. A 1 A
2. B 4 A
3. C 5 A
4. D 6 A

The opposite figure represents part of a closed electric circuit. If each resistance is 3 Ω, the value of $V_1$ is ..........

1. A 10 V
2. B 20 V
3. C 15 V
4. D 12 V

In the opposite figure, the correct order of the potentials at points x, y, z is ..........

1. A $V_x > V_y > V_z$
2. B $V_y > V_x > V_z$
3. C $V_z > V_x > V_y$
4. D $V_x > V_z > V_y$

In the circuit shown, the values are ..........

1. A $V_1$ = 4 V, $V_2$ = 10 V
2. B $V_1$ = 4 V, $V_2$ = 7 V
3. C $V_1$ = 10 V, $V_2$ = 10 V
4. D $V_1$ = 10 V, $V_2$ = 7 V

In the electric circuit shown, the voltmeter reading is ..........

1. A 20 V
2. B 15 V
3. C 5 V
4. D 0

In the circuit shown, the values of the power $(P_w)_x$, $(P_w)_y$ are ..........

1. A $(P_w)_x$ = 4 W, $(P_w)_y$ = 12 W
2. B $(P_w)_x$ = 12 W, $(P_w)_y$ = 4 W
3. C $(P_w)_x$ = 16 W, $(P_w)_y$ = 12 W
4. D $(P_w)_x$ = 4 W, $(P_w)_y$ = 14 W

The opposite figure represents part of an electric circuit, so the voltmeter reading is ..........

1. A 20 V
2. B 15 V
3. C 5 V
4. D 1 V

The opposite figure represents part of an electric circuit carrying an electric current, so the value of $V_B$ is ..........

1. A 20 V
2. B 30 V
3. C 40 V
4. D 50 V

The opposite figure represents part of an electric circuit, so the emf $V_B$ equals ..........

1. A 3 V
2. B 4 V
3. C 6 V
4. D 8 V

In the electric circuit shown in the figure, if the potential difference between points A, B is 4 V, then the resistance R equals ..........

1. A 5 Ω
2. B 10 Ω
3. C 15 Ω
4. D 20 Ω

In the circuit shown in the figure, if R = 7.5 Ω, then the potential difference between points a, b equals ..........

1. A 0
2. B 5 V
3. C 10 V
4. D 15 V

In the opposite electric circuit, if the reading of each of the three ammeters is zero and all batteries have negligible internal resistance, then the two emfs $(V_B)_1$, $(V_B)_2$ are ..........

1. A $(V_B)_1$ = 5 V, $(V_B)_2$ = 10 V
2. B $(V_B)_1$ = 10 V, $(V_B)_2$ = 5 V
3. C $(V_B)_1$ = 5 V, $(V_B)_2$ = 15 V
4. D $(V_B)_1$ = 15 V, $(V_B)_2$ = 5 V

In the opposite electric circuit:
the current $I_1$ equals ..........

1. A 1 A
2. B 2 A
3. C 3 A
4. D 4 A

In the opposite electric circuit:
the current $I_2$ equals ..........

1. A 1 A
2. B 2 A
3. C 3 A
4. D 4 A

The opposite figure shows a closed electric circuit. The resistance carrying the largest current is ..........

1. A $R_1$
2. B $R_2$
3. C $R_3$
4. D $R_1$, $R_2$

In the opposite electric circuit, if the ammeter reading is (I), then its reading when:
only switch $(K_1)$ is closed is ..........

1. A I
2. B $\dfrac{I}{2}$
3. C 2I
4. D 4I

In the opposite electric circuit, if the ammeter reading is (I), then its reading when:
only switch $(K_2)$ is closed is ..........

1. A I
2. B $\dfrac{I}{2}$
3. C 2I
4. D 4I

In the opposite electric circuit, if the ammeter reading is (I), then its reading when:
both switches $(K_1)$, $(K_2)$ are closed is ..........

1. A I
2. B $\dfrac{I}{2}$
3. C 2I
4. D 4I

In the circuit shown, if the ammeter reading is 4 A and the voltmeter reading is 3 V, then the emf $(V_B)$ equals ..........

1. A 4 V
2. B 6 V
3. C 10 V
4. D 14 V

In the opposite electric circuit, if the ammeter reading is 1 A and the voltmeter reading is 10 V, then the two resistances $(R_1)$, $(R_2)$ are ..........

1. A $R_1$ = 10 Ω, $R_2$ = 5 Ω
2. B $R_1$ = 30 Ω, $R_2$ = 2 Ω
3. C $R_1$ = 20 Ω, $R_2$ = 10 Ω
4. D $R_1$ = 20 Ω, $R_2$ = 2 Ω

From the opposite circuit:
the current $I_1$ equals ..........

1. A 4.01 A
2. B 8.02 A
3. C 0.77 A
4. D 1.11 A

From the opposite circuit:
the current $I_2$ equals ..........

1. A 0.77 A
2. B 4.01 A
3. C 8.02 A
4. D 1.11 A

From the opposite circuit:
the emf $V_B$ equals ..........

1. A 2.01 V
2. B 4.03 V
3. C 6.01 V
4. D 8.02 V

From the electric circuit shown:
the current through resistor $R_1$ is ..........

1. A 0.22 A
2. B -0.23 A
3. C 0.45 A
4. D 0.53 A

From the electric circuit shown:
the current through resistor $R_2$ is ..........

1. A 0.22 A
2. B -0.23 A
3. C 0.45 A
4. D 0.53 A

From the electric circuit shown:
the current through resistor $R_3$ is ..........

1. A 0.22 A
2. B -0.23 A
3. C 0.45 A
4. D 0.53 A

From the circuit shown in the figure:
the emf $(V_B)_1$ is ..........

1. A 5 V
2. B 8 V
3. C 15 V
4. D 20 V

From the circuit shown in the figure:
the emf $(V_B)_2$ is ..........

1. A 5 V
2. B 8 V
3. C 10 V
4. D 12 V

From the circuit shown in the figure:
the potential difference between points b, e is ..........

1. A 5 V
2. B 6 V
3. C 7 V
4. D 8 V

In the opposite electric circuit, the ammeter reads 2 A. When switch K is closed at position (1), the ammeter reads 2.2 A, and when switch K is closed at position (2), the ammeter reads 1.81 A, so:
the emf of the battery $(V_B)_1$ is ..........

1. A 20 V
2. B 22 V
3. C 18 V
4. D 16 V

In the opposite electric circuit, the ammeter reads 2 A. When switch K is closed at position (1), the ammeter reads 2.2 A, and when switch K is closed at position (2), the ammeter reads 1.81 A, so:
the resistance (R) equals ..........

1. A 3 Ω
2. B 6 Ω
3. C 2 Ω
4. D 12 Ω

In the opposite electric circuit, the ammeter reads 2 A. When switch K is closed at position (1), the ammeter reads 2.2 A, and when switch K is closed at position (2), the ammeter reads 1.81 A, so:
the emf of the battery $(V_B)_2$ is approximately ..........

1. A 12 V
2. B 14 V
3. C 16 V
4. D 18 V

Using Kirchhoff's two laws in the circuit shown: (note that the directions marked on the figure are assumed directions and not necessarily the true current directions)
the current $I_1$ is ..........

1. A 0.36 A
2. B 0.6 A
3. C -0.36 A
4. D -0.6 A

Using Kirchhoff's two laws in the circuit shown: (note that the directions marked on the figure are assumed directions and not necessarily the true current directions)
the current $I_2$ is ..........

1. A 0.96 A
2. B 0.6 A
3. C -0.96 A
4. D -0.6 A

Using Kirchhoff's two laws in the circuit shown: (note that the directions marked on the figure are assumed directions and not necessarily the true current directions)
the current $I_3$ is ..........

1. A 0.36 A
2. B 0.96 A
3. C -0.36 A
4. D -0.96 A

A student connected two batteries of 6 V and 12 V with negligible internal resistance, two identical ohmic resistors, two ammeters and a switch to form an electric circuit as in figure (1). Then he reversed the polarity of the 6 V battery so that the circuit became as in figure (2).
When switch (K) is closed, what happens to the readings of the ammeters $A_1$, $A_2$ respectively:
in the circuit of figure (1)?

1. A decreases, increases
2. B decreases, does not change
3. C does not change, decreases
4. D increases, decreases

A student connected two batteries of 6 V and 12 V with negligible internal resistance, two identical ohmic resistors, two ammeters and a switch to form an electric circuit as in figure (1). Then he reversed the polarity of the 6 V battery so that the circuit became as in figure (2).
When switch (K) is closed, what happens to the readings of the ammeters $A_1$, $A_2$ respectively:
in the circuit of figure (2)?

1. A increases, does not change
2. B increases, increases
3. C decreases, decreases
4. D does not change, does not change

From the opposite electric circuit:
the potential difference between points a, b is ..........

1. A 1 V
2. B 2 V
3. C 4 V
4. D 6 V

From the opposite electric circuit:
the emf $(V_B)_1$ is ..........

1. A 9 V
2. B 6 V
3. C 4 V
4. D 2 V

From the opposite electric circuit:
the resistance R is ..........

1. A 2.5 Ω
2. B 2 Ω
3. C 4 Ω
4. D 7.5 Ω

From the circuit shown, the ratio $\dfrac{(V_B)_1}{(V_B)_2}$ is ..........

1. A $\dfrac{4}{5}$
2. B $\dfrac{5}{4}$
3. C $\dfrac{9}{7}$
4. D $\dfrac{7}{9}$

From the opposite circuit:
the current through resistor $R_3$ is ..........

1. A $\dfrac{5}{3}$ A
2. B $\dfrac{4}{7}$ A
3. C $\dfrac{2}{7}$ A
4. D $\dfrac{4}{9}$ A

From the opposite circuit:
the power consumed in the electric circuit is ..........

1. A 8.57 W
2. B 4.42 W
3. C 3.51 W
4. D 2.31 W

The opposite circuit contains identical cells with negligible internal resistance. Which resistance carries no electric current?

1. A $R_1$
2. B $R_2$
3. C $R_3$
4. D $R_1$, $R_2$

The opposite figure represents an electric circuit. If $V_2 = 4 V_1$, then I equals ..........

1. A 2 A
2. B 4 A
3. C 6 A
4. D 8 A

The opposite figure represents a closed electric circuit, so ..........

1. A $V_{xy} > V_{xz}$
2. B $V_{xy} = V_{xz}$
3. C $V_{xy} < V_{xz}$
4. D $V_{xy} = V_{yz}$

In the following electric circuits, all resistors are identical and all batteries are identical with negligible internal resistance. In which circuit is the reading of ammeter $A_1$ twice the reading of ammeter $A_2$?

1. A A
2. B B
3. C C
4. D D

In the electric circuit shown, the wire ab is a uniform resistance of 10 Ω and point c, where the slider touches wire ab, divides it into two resistances $R_1$, $R_2$ such that $R_2 = 1.5 R_1$, so:
the current $I_1$ equals ..........

1. A 0.93 A
2. B 1.09 A
3. C 1.64 A
4. D 2.73 A

In the electric circuit shown, the wire ab is a uniform resistance of 10 Ω and point c, where the slider touches wire ab, divides it into two resistances $R_1$, $R_2$ such that $R_2 = 1.5 R_1$, so:
the current $I_2$ equals ..........

1. A 0.93 A
2. B 1.09 A
3. C 1.64 A
4. D 2.73 A

In the electric circuit shown, the wire ab is a uniform resistance of 10 Ω and point c, where the slider touches wire ab, divides it into two resistances $R_1$, $R_2$ such that $R_2 = 1.5 R_1$, so:
the current I equals ..........

1. A 0.93 A
2. B 1.09 A
3. C 1.64 A
4. D 2.73 A

The opposite figure represents part of an electric circuit. Using Kirchhoff's two laws and keeping to the current directions, the path and the data shown, the value of:
the potential difference between points X, Y equals ..........

1. A 5 V
2. B 7 V
3. C 10 V
4. D 11 V

The opposite figure represents part of an electric circuit. Using Kirchhoff's two laws and keeping to the current directions, the path and the data shown, the value of:
the emf of the battery $(V_B)_2$ equals ..........

1. A 4 V
2. B 8 V
3. C 9.5 V
4. D 11 V

The opposite figure represents part of an electric circuit carrying a current of 1 A, so ..........

1. A potential of point A $(V_A)$ = -1.5 V, potential of point B $(V_B)$ = 2 V
2. B potential of point A $(V_A)$ = 1.5 V, potential of point B $(V_B)$ = 2 V
3. C potential of point A $(V_A)$ = -1.5 V, potential of point B $(V_B)$ = 0.5 V
4. D potential of point A $(V_A)$ = 1.5 V, potential of point B $(V_B)$ = -0.5 V

In the opposite electric circuit, if the reading of voltmeter $V_1$ is 21 V and the reading of voltmeter $V_2$ is 24 V, then:
the ammeter reading is ..........

1. A 1 A
2. B 2 A
3. C 3 A
4. D 4 A

In the opposite electric circuit, if the reading of voltmeter $V_1$ is 21 V and the reading of voltmeter $V_2$ is 24 V, then:
the resistance $(R_1)$ equals ..........

1. A 2 Ω
2. B 4 Ω
3. C 5 Ω
4. D 6 Ω

In the opposite electric circuit, if the reading of voltmeter $V_1$ is 21 V and the reading of voltmeter $V_2$ is 24 V, then:
the resistance $(R_2)$ equals ..........

1. A 2 Ω
2. B 4 Ω
3. C 5 Ω
4. D 6 Ω

The following figure shows part of a circuit. If the power consumed between points a, b is 210 W and the internal resistance of the cells is negligible, then:
the unknown emf $(V_B)$ equals ..........

1. A 30 V
2. B 20 V
3. C 10 V
4. D 5 V

The following figure shows part of a circuit. If the power consumed between points a, b is 210 W and the internal resistance of the cells is negligible, then:
the potential difference between points a, b equals ..........

1. A 20 V
2. B 30 V
3. C 40 V
4. D 50 V

From the electric circuit shown in the figure, the readings of the ammeter and the voltmeter are ..........

1. A ammeter reading 2 A, voltmeter reading 5 V
2. B ammeter reading 1 A, voltmeter reading 5 V
3. C ammeter reading 2 A, voltmeter reading 3 V
4. D ammeter reading 1 A, voltmeter reading 3 V

In the electric circuit shown in the figure:
the readings of the ammeter (A) and the voltmeter (V) are ..........

1. A ammeter reading 0.067 A, voltmeter reading 5.6 V
2. B ammeter reading 0.067 A, voltmeter reading 3.7 V
3. C ammeter reading 4.067 A, voltmeter reading 5.6 V
4. D ammeter reading 4.067 A, voltmeter reading 3.7 V

In the electric circuit shown in the figure:
the resistance R is ..........

1. A 11 Ω
2. B 12 Ω
3. C 31 Ω
4. D 36 Ω

In the opposite electric circuit, if the voltmeter reading is 6 V, then the emf $(V_B)$ equals ..........

1. A 4 V
2. B 8 V
3. C 10 V
4. D 12 V

In the opposite electric circuit:
the magnitude and direction of the current through the 2 Ω resistor are ..........

1. A 1.5 A from A to B
2. B 1.5 A from B to A
3. C 2.5 A from A to B
4. D 2.5 A from B to A

In the opposite electric circuit:
the current $I_1$ is ..........

1. A 1 A
2. B 2 A
3. C 3 A
4. D 4 A

In the opposite electric circuit:
the current $I_3$ is ..........

1. A 1.5 A
2. B 2.5 A
3. C 3.5 A
4. D 4.5 A

In the opposite electric circuit, if the current through resistor (R) is 1 A, then R equals ..........

1. A 1.5 Ω
2. B 3 Ω
3. C 6 Ω
4. D 12 Ω

From the circuit shown in the drawing, the total resistance of the circuit is ..........

1. A 0.5 Ω
2. B 1 Ω
3. C 1.18 Ω
4. D 1.25 Ω

In the opposite electric circuit, what happens to the power consumed in resistor S when closing:
only switch $K_1$?

1. A increases
2. B decreases
3. C does not change
4. D becomes zero

In the opposite electric circuit, what happens to the power consumed in resistor S when closing:
only switch $K_2$?

1. A increases
2. B decreases
3. C does not change
4. D becomes zero

In the figure shown, 12 resistors, each R, are connected together in the form of a cube, so the equivalent resistance in terms of R is ..........

1. A $\dfrac{1}{2}$ R
2. B $\dfrac{5}{6}$ R
3. C $\dfrac{3}{2}$ R
4. D R

State the scientific principle on which each of the following is based:
(1) Kirchhoff's first law.
(2) Kirchhoff's second law.

The opposite figure represents part of a closed electric circuit.
Calculate the current $I_2$

Calculate the currents $I_3$, $I_4$ in the opposite electric circuit.

From the circuit shown, calculate the current through the $3\ \Omega$ resistor

The opposite figure represents an electric circuit. Calculate the emf of the battery $(V_B)$, neglecting its internal resistance.

In the opposite electric circuit, the reading of ammeter $A_1$ is $1\ A$ and the internal resistance of the batteries is negligible. Calculate the ratio between the readings of the two ammeters $\frac{A_2}{A_3}$

In the opposite electric circuit, prove that: $\frac{V_1}{V_2}=\frac{1}{2}$

The opposite figure shows part of an electric circuit. If the potential difference between points x, y is $16\ V$, calculate the current I

In the opposite electric circuit, if the internal resistance of the batteries is negligible, calculate:
(1) the voltmeter reading (V).
(2) the emf $(V_B)$.

From the opposite circuit, calculate the current through the $12\ \Omega$ resistor

In the opposite electric circuit, find the readings of the ammeter and the voltmeter.

In the opposite electric circuit, if the current (I) is the same through each of the two batteries and equals (I), find the ratio between the two resistances $\frac{R_1}{R_2}$

In the opposite circuit, calculate the current through the $10\ V$ battery

The opposite figure shows an electric circuit containing identical cells with negligible internal resistance and identical lamps. Which lamp's filament glows more brightly?

In the opposite figure, applying Kirchhoff's first law at point (x) gives .......... (Trial exam / June 2021)

1. A $I_1+I_3+I_4+I_2+I_5=0$
2. B $-I_1-I_3-I_4+I_2+I_5=0$
3. C $-I_1-I_3+I_4+I_2+I_5=0$
4. D $I_1+I_3+I_4-I_2+I_5=0$

From the circuit shown in the figure, .......... (2nd session 2021)

1. A $-I_1-I_2+I_3=0$
2. B $I_1-I_2-I_3=0$
3. C $-I_1+I_2+I_3=0$
4. D $I_1+I_2+I_3=0$

The figure represents part of a closed electric circuit. The directions of $I_1$, $I_2$, $I_3$ are conventional current directions, while the direction of $I_4$ is the direction of motion of the free electrons, so $I_3$ = .......... (2nd session 2022)

1. A $I_1+I_2-I_4$
2. B $I_1+I_2+I_4$
3. C $I_4+I_1-I_2$
4. D $I_4+I_2-I_1$

The figure shows part of an electric circuit, so I equals .......... (2nd session 2023)

1. A $11\ A$
2. B $2\ A$
3. C $1\ A$
4. D $4\ A$

The opposite figure represents electric currents flowing in several branches. The value of the current (I) and the direction of the current $(7\ A)$ respectively are .......... (Sample exam 2025)

1. A $4\ A$, from a to d
2. B $4\ A$, from d to a
3. C $13\ A$, from a to d
4. D $13\ A$, from d to a

In the figure, the directions shown represent the direction of electron motion. The currents in branches xa, xc, xd are $6\ A$, $3\ A$, $15\ A$ respectively, and $2.5\times10^{19}$ electrons / second pass in branch xb. The number of electrons passing through branch xf and their direction of motion are .......... (Sample exam 2025)

1. A $1\times10^{20}$ electrons / second, from x to f
2. B $1\times10^{20}$ electrons / second, from f to x
3. C $1.6\times10^{19}$ electrons / second, from x to f
4. D $1.6\times10^{19}$ electrons / second, from f to x

Using the data written on the circuit in front of you, the ratio $\frac{I_2}{I_1}$ equals .......... (Trial exam / May 2021)

1. A $\frac{2}{1}$
2. B $\frac{3}{1}$
3. C $\frac{1}{2}$
4. D $\frac{1}{3}$

In the electric circuit shown, the current $I_3$ equals .......... (Trial exam / June 2021)

1. A $1.2\ A$
2. B $1.25\ A$
3. C $2\ A$
4. D $2.45\ A$

In the circuit shown in the figure, Kirchhoff's laws can be applied to the closed path (adcba) as follows .......... (1st session 2021)

1. A $2I_1+I_2+4=0$
2. B $2I_1-I_2-20=0$
3. C $2I_1-I_2+4=0$
4. D $3I_1-I_3-4=0$

In the electric circuit shown, if $(I_3=-2I_1)$, then the current through resistor $R_3$ equals .......... (1st session 2021)

1. A $\frac{3}{7}\ A$
2. B $\frac{4}{7}\ A$
3. C $1\ A$
4. D $\frac{2}{7}\ A$

In the circuit shown, if $I_3$ equals $2\ A$, then $I_2$ equals .......... (2nd session 2021)

1. A $1\ A$
2. B $2\ A$
3. C $3\ A$
4. D $4\ A$

In the electric circuit shown in the figure, if the ammeter reading is zero, then $(V_B)_2$ equals .......... (1st session 2022)

1. A $6\ V$
2. B $4.5\ V$
3. C $8\ V$
4. D $12\ V$

In the circuit shown, the current through the $8\ \Omega$ resistor equals .......... (1st session 2022)

1. A $0.23\ A$
2. B $0.846\ A$
3. C $1.077\ A$
4. D $1.306\ A$

In the electric circuit shown, the value of $V_B$ equals .......... (2nd session 2022)

1. A $10\ V$
2. B $4\ V$
3. C $15\ V$
4. D $6\ V$

In the circuit shown in the figure, the emf $(V_B)$ is .......... (Trial exam 2023)

1. A $12\ V$
2. B $\frac{4}{3}\ V$
3. C $\frac{40}{3}\ V$
4. D $\frac{44}{3}\ V$

You have an electric circuit as in the figure, so the ratio $\frac{I_3}{I_2}$ equals .......... (1st session 2023)

1. A $\frac{2}{1}$
2. B $\frac{1}{4}$
3. C $\frac{1}{2}$
4. D $\frac{4}{1}$

The figure in front of you represents part of a closed electric circuit, so the resistance R equals .......... (2nd session 2023)

1. A $4\ \Omega$
2. B $2\ \Omega$
3. C $6\ \Omega$
4. D $3\ \Omega$

You have an electric circuit as in the figure, so the relation between the two currents $I_1$, $I_3$ is .......... (1st session 2024)

1. A $I_1=2.25I_3$
2. B $I_1=1.25I_3$
3. C $I_1=0.8I_3$
4. D $I_1=1.8I_3$

The opposite figure shows part of an electric circuit. Using Kirchhoff's two laws, which of the following equations is correct? (2nd session 2024)

1. A $3I_1+7I_2=-3V_B$
2. B $3I_2-5I_3=-3V_B$
3. C $3I_2-5I_3=3V_B$
4. D $3I_1-8I_2=3V_B$

The opposite figure represents part of an electric circuit carrying an electric current, so the value of $V_B$ is .......... (Sample exam 2025)

1. A $30\ V$
2. B $25\ V$
3. C $20\ V$
4. D $15\ V$

In the electric circuit shown in the figure, what are the values of $(V_B)$ and $(R)$? (1st session 2025)

1. A $V_B=30\ V$, $R=40\ \Omega$
2. B $V_B=20\ V$, $R=30\ \Omega$
3. C $V_B=30\ V$, $R=20\ \Omega$
4. D $V_B=20\ V$, $R=40\ \Omega$

In the electric circuit shown in the figure, what are the values of $(I_1)$ and $(I_2)$? (2nd session 2025)

1. A $I_1=0.215\ A$, $I_2=0.447\ A$
2. B $I_1=0.215\ A$, $I_2=0.232\ A$
3. C $I_1=0.232\ A$, $I_2=0.132\ A$
4. D $I_1=0.232\ A$, $I_2=0.215\ A$

The opposite figure represents part of an electric circuit. If the potential difference between points A, B is $16\ V$, then the current through the $2\ \Omega$ resistor equals .......... (Sample exam 2026)

1. A $2.5\ A$
2. B $3.5\ A$
3. C $4\ A$
4. D zero