Current Electricity Study Materials for Competitive Exams

Current Electricity

Q. If a 9V battery is connected to a 3Ω resistor, what is the current flowing through it? (2021)

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

Solution

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

Correct Answer: B — 2A

Learn More →

Q. If a 9V battery is connected to a 3Ω resistor, what is the energy consumed in 10 seconds? (2023)

A. 30J
B. 90J
C. 60J
D. 45J

Solution

Power (P) = V²/R = 9²/3 = 27W. Energy (E) = P * t = 27W * 10s = 270J.

Correct Answer: B — 90J

Learn More →

Q. If a 9V battery is connected to a 3Ω resistor, what is the power dissipated in the resistor? (2023)

A. 3W
B. 9W
C. 6W
D. 12W

Solution

Power (P) can be calculated using P = V²/R = (9V)² / 3Ω = 81 / 3 = 27W.

Correct Answer: A — 3W

Learn More →

Q. If a 9V battery is connected to a 3Ω resistor, what is the voltage drop across the resistor? (2023)

A. 3V
B. 6V
C. 9V
D. 12V

Solution

The voltage drop across the resistor is equal to the battery voltage, which is 9V.

Correct Answer: C — 9V

Learn More →

Q. If a circuit has a total resistance of 12Ω and a current of 1.5A flows through it, what is the voltage across the circuit? (2022)

A. 18V
B. 12V
C. 15V
D. 10V

Solution

Using Ohm's law, V = IR = 1.5A * 12Ω = 18V.

Correct Answer: A — 18V

Learn More →

Q. If a circuit has a total resistance of 12Ω and a current of 1.5A, what is the voltage across the circuit? (2021)

A. 18V
B. 12V
C. 15V
D. 10V

Solution

Using Ohm's law, V = IR = 1.5A * 12Ω = 18V.

Correct Answer: A — 18V

Learn More →

Q. If a circuit has a total resistance of 12Ω and a current of 3A flows through it, what is the voltage across the circuit? (2020)

A. 36V
B. 12V
C. 4V
D. 24V

Solution

Using Ohm's law, V = IR = 3A * 12Ω = 36V.

Correct Answer: A — 36V

Learn More →

Q. If a circuit has a total resistance of 12Ω and a current of 4A, what is the voltage across the circuit? (2023)

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

Solution

Using Ohm's law, V = IR = 4A * 12Ω = 48V.

Correct Answer: A — 48V

Learn More →

Q. If a circuit has a total resistance of 5Ω and a current of 2A, what is the voltage across the circuit? (2022)

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

Solution

Using Ohm's law, V = I * R = 2A * 5Ω = 10V.

Correct Answer: A — 10V

Learn More →

Q. If a circuit has a total resistance of 8Ω and a current of 4A, what is the voltage across the circuit? (2023)

A. 32V
B. 24V
C. 16V
D. 12V

Solution

Using Ohm's law, V = IR = 4A * 8Ω = 32V.

Correct Answer: A — 32V

Learn More →

Q. If the current through a resistor is tripled, what happens to the power dissipated in the resistor? (2022)

A. Increases by 3 times
B. Increases by 9 times
C. Remains the same
D. Decreases by 3 times

Solution

Power is proportional to the square of the current (P = I²R). If I is tripled, P increases by 3² = 9 times.

Correct Answer: B — Increases by 9 times

Learn More →

Q. If the resistance of a conductor is doubled, what happens to the current flowing through it when the voltage remains constant? (2022)

A. Doubles
B. Halves
C. Remains the same
D. Increases by 1.5 times

Solution

According to Ohm's law, I = V/R. If R is doubled, I will be halved.

Correct Answer: B — Halves

Learn More →

Q. If the voltage across a resistor is halved, what happens to the current through it? (2020)

A. It doubles
B. It halves
C. It remains the same
D. It quadruples

Solution

According to Ohm's law, if voltage is halved and resistance remains constant, the current also halves.

Correct Answer: B — It halves

Learn More →

Q. If two resistors of 4Ω and 6Ω are connected in series, what is the total resistance? (2023)

A. 10Ω
B. 24Ω
C. 2.4Ω
D. 12Ω

Solution

In series, R_eq = R1 + R2 = 4Ω + 6Ω = 10Ω.

Correct Answer: A — 10Ω

Learn More →

Q. If two resistors of 4Ω and 6Ω are connected in series, what is the total voltage across them if the current is 2A? (2022)

A. 20V
B. 12V
C. 8V
D. 10V

Solution

Total resistance R = 4Ω + 6Ω = 10Ω. Voltage V = I * R = 2A * 10Ω = 20V.

Correct Answer: A — 20V

Learn More →

Q. In a circuit with a 24V battery and two 8Ω resistors in series, what is the total current? (2022)

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

Solution

Total resistance R = 8Ω + 8Ω = 16Ω. Current I = V/R = 24V / 16Ω = 1.5A.

Correct Answer: B — 2A

Learn More →

Q. In a circuit with a 24V battery and two resistors of 4Ω and 8Ω in parallel, what is the total current supplied by the battery? (2022)

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

Solution

First, find the equivalent resistance: 1/R_eq = 1/4 + 1/8 = 3/8, so R_eq = 8/3Ω. Then, I = V/R_eq = 24V / (8/3)Ω = 9A.

Correct Answer: D — 6A

Learn More →

Q. In a circuit with a 5Ω and a 10Ω resistor in parallel, what is the total current if the voltage across them is 20V? (2022)

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

Solution

First, find the equivalent resistance: 1/R_eq = 1/5 + 1/10 = 3/10, R_eq = 10/3Ω. Then, I = V/R_eq = 20V / (10/3)Ω = 6A.

Correct Answer: A — 4A

Learn More →

Q. In a circuit with a 9V battery and a 3Ω resistor, what is the current flowing through the resistor? (2023)

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

Solution

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

Correct Answer: B — 2A

Learn More →

Q. In a circuit with a 9V battery and a 3Ω resistor, what is the power dissipated by the resistor? (2021)

A. 3W
B. 9W
C. 6W
D. 12W

Solution

Power is given by P = V²/R = (9V)² / 3Ω = 81V² / 3Ω = 27W.

Correct Answer: B — 9W

Learn More →

Q. In a circuit with a 9V battery and a 3Ω resistor, what is the power dissipated in the resistor? (2023)

A. 3W
B. 9W
C. 6W
D. 12W

Solution

Power P = V²/R = (9V)² / 3Ω = 81 / 3 = 27W.

Correct Answer: B — 9W

Learn More →

Q. In a circuit, if the current is doubled while the resistance remains constant, what happens to the power? (2020)

A. It doubles
B. It quadruples
C. It remains the same
D. It halves

Solution

Power is given by P = I²R. If I is doubled, P becomes (2I)²R = 4I²R, which is quadrupled.

Correct Answer: B — It quadruples

Learn More →

Q. In a circuit, if the current is doubled while the resistance remains constant, what happens to the power consumed? (2020)

A. It doubles
B. It triples
C. It remains the same
D. It halves

Solution

Power is given by P = I²R. If I is doubled, P becomes (2I)²R = 4I²R, which means power quadruples.

Correct Answer: A — It doubles

Learn More →

Q. In a circuit, if the resistance is halved while the voltage remains constant, what happens to the current? (2022)

A. It halves
B. It doubles
C. It remains the same
D. It quadruples

Solution

According to Ohm's law, I = V/R. If R is halved, I will double.

Correct Answer: B — It doubles

Learn More →

Q. In a circuit, if the voltage is doubled and the resistance remains constant, what happens to the current? (2020)

A. Doubles
B. Halves
C. Remains the same
D. Quadruples

Solution

According to Ohm's law, I = V/R. If V is doubled, I also doubles.

Correct Answer: A — Doubles

Learn More →

Q. In a parallel circuit with two resistors of 4Ω and 12Ω, what is the total current if the voltage across the circuit is 24V? (2022)

A. 4A
B. 6A
C. 8A
D. 10A

Solution

First, find the equivalent resistance: 1/R_eq = 1/4 + 1/12 = 3/12 + 1/12 = 4/12, R_eq = 3Ω. Then, I = V/R_eq = 24V / 3Ω = 8A.

Correct Answer: C — 8A

Learn More →

Q. In a parallel circuit with two resistors of 4Ω and 12Ω, what is the total current if the voltage across them is 24V? (2022)

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

Solution

Total current I = V/R_eq. First, find R_eq = 1/(1/4 + 1/12) = 3Ω. Then, I = 24V / 3Ω = 8A.

Correct Answer: A — 6A

Learn More →

Q. In a parallel circuit with two resistors of 6Ω and 3Ω, what is the total current if a 12V battery is connected? (2021)

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

Solution

First, find the equivalent resistance: 1/R_eq = 1/6 + 1/3 = 1/2, so R_eq = 2Ω. Then, I = V/R_eq = 12V / 2Ω = 6A.

Correct Answer: C — 6A

Learn More →

Q. In a parallel circuit with two resistors of 6Ω and 3Ω, what is the total resistance? (2019)

A. 2Ω
B. 4Ω
C. 1.5Ω
D. 9Ω

Solution

Using the formula 1/R_eq = 1/R1 + 1/R2, we get 1/R_eq = 1/6 + 1/3 = 1/6 + 2/6 = 3/6, thus R_eq = 2Ω.

Correct Answer: B — 4Ω

Learn More →

Q. In a parallel circuit with two resistors of 8Ω and 4Ω, what is the total current if the voltage across the circuit is 16V? (2022)

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

Solution

First, find the equivalent resistance: 1/R_eq = 1/8 + 1/4 = 1/8 + 2/8 = 3/8, so R_eq = 8/3Ω. Then, I = V/R_eq = 16V / (8/3)Ω = 16 * 3/8 = 6A.

Correct Answer: D — 8A

Learn More →

Showing 31 to 60 of 93 (4 Pages)

Current Electricity

On a scale of 0–10, how likely are you to recommend The Soulshift Academy?