Current Electricity Study Materials for Competitive Exams

Current Electricity

Circuits & Kirchhoff Laws Ohms Law Potentiometer Resistivity Wheatstone Bridge

Q. What is the total current flowing through a circuit if the total voltage is 12 V and the total resistance is 4 ohms?

A. 3 A
B. 4 A
C. 12 A
D. 48 A

Solution

Using Ohm's Law, I = V / R. Here, I = 12 V / 4 ohms = 3 A.

Correct Answer: A — 3 A

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Q. What is the total current flowing through a circuit if the total voltage is 12V and the total resistance is 4Ω?

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

Solution

Using Ohm's Law (I = V/R), the current is I = 12V / 4Ω = 3A.

Correct Answer: B — 3A

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Q. What is the total current flowing through a circuit if the total voltage is 24V and the total resistance is 6Ω?

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

Solution

Using Ohm's Law, I = V/R = 24V / 6Ω = 4A.

Correct Answer: B — 4A

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Q. What is the total current flowing through a circuit with a 10V battery and two 5Ω resistors in parallel?

A. 1A
B. 2A
C. 5A
D. 10A

Solution

Equivalent resistance R_eq = 1/(1/5 + 1/5) = 2.5Ω. Total current I = V/R_eq = 10V/2.5Ω = 4A.

Correct Answer: B — 2A

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Q. What is the total current flowing through a circuit with a 10V battery and two 5Ω resistors in series?

A. 0.5A
B. 1A
C. 2A
D. 5A

Solution

Total resistance R = R1 + R2 = 5Ω + 5Ω = 10Ω. Using Ohm's law, I = V/R = 10V/10Ω = 1A.

Correct Answer: B — 1A

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Q. What is the total current flowing through a junction where 5A enters and 3A and 2A leave?

A. 0A
B. 2A
C. 3A
D. 5A

Solution

According to Kirchhoff's Current Law, the total current entering a junction equals the total current leaving. Here, 5A = 3A + 2A.

Correct Answer: A — 0A

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Q. What is the total current in a circuit with a 10V battery and two 5 ohm resistors in parallel?

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

Solution

Equivalent resistance R_eq = 1/(1/5 + 1/5) = 2.5 ohms. Total current I = V/R_eq = 10V / 2.5Ω = 4 A.

Correct Answer: B — 2 A

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Q. What is the total current in a circuit with a 12V battery and a total resistance of 3 ohms?

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

Solution

Using Ohm's law, I = V/R, we have I = 12V / 3 ohms = 4 A.

Correct Answer: A — 4 A

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Q. What is the total current in a circuit with a 12V battery and three 4 ohm resistors connected in series?

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

Solution

Total resistance R_total = 4 + 4 + 4 = 12 ohms. Current I = V/R_total = 12V / 12 ohms = 1A.

Correct Answer: B — 2A

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Q. What is the total current in a circuit with a 12V battery and three resistors (R1 = 4Ω, R2 = 4Ω, R3 = 4Ω) connected in parallel?

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

Solution

Total resistance R_eq = 1 / (1/R1 + 1/R2 + 1/R3) = 1 / (1/4 + 1/4 + 1/4) = 1.33Ω. Current I = V / R_eq = 12V / 1.33Ω ≈ 9A.

Correct Answer: B — 4A

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Q. What is the total current in a circuit with a 12V battery and two 4 ohm resistors in series?

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

Solution

Total resistance R = R1 + R2 = 4 + 4 = 8 ohms. Current I = V/R = 12V / 8 ohms = 1.5 A.

Correct Answer: B — 2 A

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Q. What is the total current in a circuit with a 24V battery and three resistors (2Ω, 4Ω, and 6Ω) connected in series?

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

Solution

Total resistance R = R1 + R2 + R3 = 2Ω + 4Ω + 6Ω = 12Ω. Using Ohm's law, I = V/R = 24V / 12Ω = 2A.

Correct Answer: B — 3A

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Q. What is the total current in a circuit with a 9V battery and a 3Ω resistor?

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

Solution

Using Ohm's law, I = V/R = 9V/3Ω = 3A.

Correct Answer: B — 2A

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Q. What is the total current in a circuit with a 9V battery and two 3Ω resistors in parallel?

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

Solution

Total resistance R = 1/(1/3 + 1/3) = 1.5Ω; I = V/R = 9V/1.5Ω = 6A.

Correct Answer: B — 2A

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Q. What is the total current in a circuit with two branches, one carrying 2 A and the other 3 A?

A. 5 A
B. 6 A
C. 1 A
D. 0 A

Solution

In a parallel circuit, the total current is the sum of the currents in each branch: I_total = I1 + I2 = 2 A + 3 A = 5 A.

Correct Answer: A — 5 A

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Q. What is the total power consumed in a circuit with a 12V battery and a 4Ω resistor?

A. 12W
B. 24W
C. 36W
D. 48W

Solution

Power P = V^2/R = (12V)^2/4Ω = 36W.

Correct Answer: B — 24W

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Q. What is the total power consumed in a circuit with a current of 5A and a total resistance of 4Ω?

A. 10W
B. 20W
C. 30W
D. 40W

Solution

Power (P) = I^2 * R = 5^2 * 4 = 25 * 4 = 100W.

Correct Answer: D — 40W

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Q. What is the total resistance in a circuit with a 10Ω resistor in series with a 5Ω resistor?

A. 5Ω
B. 10Ω
C. 15Ω
D. 50Ω

Solution

In series, total resistance (R_total) = R1 + R2 = 10Ω + 5Ω = 15Ω.

Correct Answer: C — 15Ω

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Q. What is the total resistance in a circuit with a 12 ohm and a 4 ohm resistor connected in parallel?

A. 3 ohms
B. 4 ohms
C. 9 ohms
D. 16 ohms

Solution

1/R_eq = 1/12 + 1/4 => R_eq = 3 ohms.

Correct Answer: A — 3 ohms

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Q. What is the total resistance in a circuit with a 12Ω resistor and a 4Ω resistor connected in series?

A. 16Ω
B. 48Ω
C. 3Ω
D. 8Ω

Solution

In series, total resistance R_total = R1 + R2 = 12Ω + 4Ω = 16Ω.

Correct Answer: A — 16Ω

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Q. What is the total resistance of a circuit with a 3Ω and a 5Ω resistor in series?

A. 8Ω
B. 15Ω
C. 2Ω
D. 1.5Ω

Solution

Total resistance R = R1 + R2 = 3Ω + 5Ω = 8Ω.

Correct Answer: A — 8Ω

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Q. What is the total resistance of two 10 ohm resistors connected in parallel?

A. 5 ohms
B. 10 ohms
C. 20 ohms
D. 15 ohms

Solution

1/R_eq = 1/R1 + 1/R2 = 1/10 + 1/10 = 2/10. Thus, R_eq = 10/2 = 5 ohms.

Correct Answer: A — 5 ohms

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Q. What is the total resistance of two 10 ohm resistors connected in series?

A. 5 ohms
B. 10 ohms
C. 20 ohms
D. 15 ohms

Solution

In series, R_eq = R1 + R2 = 10 + 10 = 20 ohms.

Correct Answer: C — 20 ohms

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Q. What is the total resistance of two 12 ohm resistors connected in parallel?

A. 6 ohms
B. 12 ohms
C. 24 ohms
D. 18 ohms

Solution

1/R_eq = 1/R1 + 1/R2 = 1/12 + 1/12 = 2/12. Thus, R_eq = 12/2 = 6 ohms.

Correct Answer: A — 6 ohms

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Q. What is the total resistance of two 8Ω resistors connected in series?

A. 8Ω
B. 16Ω
C. 4Ω
D. 12Ω

Solution

In series, R_eq = R1 + R2 = 8 + 8 = 16Ω.

Correct Answer: B — 16Ω

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Q. What is the total resistance of two resistors of 5 ohms and 10 ohms connected in parallel?

A. 3.33 ohms
B. 5 ohms
C. 15 ohms
D. 50 ohms

Solution

1/R_eq = 1/5 + 1/10 => R_eq = 3.33 ohms.

Correct Answer: A — 3.33 ohms

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Q. What is the total resistance of two resistors of 8Ω and 12Ω connected in series?

A. 20Ω
B. 24Ω
C. 16Ω
D. 18Ω

Solution

In series, R_eq = R1 + R2 = 8 + 12 = 20Ω.

Correct Answer: A — 20Ω

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Q. What is the total voltage across a parallel circuit with two branches, one with 10Ω and 20Ω resistors, if the total current is 3A?

A. 6V
B. 9V
C. 12V
D. 15V

Solution

Using the formula V = I * R_eq. First, find R_eq = 1 / (1/10 + 1/20) = 6.67Ω. Then, V = 3A * 6.67Ω = 20V.

Correct Answer: C — 12V

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Q. What is the total voltage in a series circuit with a 9V battery and two resistors of 2Ω and 3Ω?

A. 9V
B. 5V
C. 2V
D. 11V

Solution

In a series circuit, the total voltage is equal to the voltage of the battery, which is 9V.

Correct Answer: A — 9V

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Q. What is the unit of electrical resistance?

A. Volt
B. Ampere
C. Ohm
D. Watt

Solution

The unit of electrical resistance is Ohm.

Correct Answer: C — Ohm

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Current Electricity

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