Current Electricity - Ohm's Law for Competitive Exams

Current Electricity - Ohms Law

Q. A 10-ohm resistor is connected to a 20-volt battery. What is the power consumed by the resistor? (2021)

A. 20 W
B. 40 W
C. 10 W
D. 2 W

Solution

Power (P) can be calculated using the formula P = V^2 / R. Here, P = 20^2 / 10 = 400 / 10 = 40 W.

Correct Answer: B — 40 W

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Q. A circuit has a current of 2A and a resistance of 6Ω. What is the voltage across the circuit? (2020)

A. 6V
B. 12V
C. 8V
D. 10V

Solution

Using Ohm's Law, V = I * R = 2A * 6Ω = 12V.

Correct Answer: B — 12V

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Q. A circuit has a current of 3A and a resistance of 6Ω. What is the voltage across the circuit? (2019)

A. 9V
B. 18V
C. 3V
D. 6V

Solution

Using Ohm's Law, V = I * R = 3A * 6Ω = 18V.

Correct Answer: A — 9V

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Q. A circuit has a current of 5A and a resistance of 10Ω. What is the power consumed in the circuit? (2020)

A. 25W
B. 50W
C. 75W
D. 100W

Solution

Power (P) can be calculated using P = I^2 * R = (5A)^2 * 10Ω = 25 * 10 = 250W.

Correct Answer: B — 50W

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Q. A circuit has a current of 5A and a resistance of 2Ω. What is the power consumed in the circuit? (2020)

A. 10W
B. 25W
C. 50W
D. 100W

Solution

Power (P) can be calculated using the formula P = I^2 * R = (5A)^2 * 2Ω = 25W.

Correct Answer: B — 25W

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Q. A circuit has a current of 5A and a resistance of 2Ω. What is the voltage across the circuit? (2020)

A. 10V
B. 5V
C. 2.5V
D. 15V

Solution

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

Correct Answer: A — 10V

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Q. If a 10Ω resistor carries a current of 2A, what is the voltage across the resistor? (2023)

A. 5V
B. 10V
C. 20V
D. 30V

Solution

Using Ohm's Law, V = I * R = 2A * 10Ω = 20V.

Correct Answer: C — 20V

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Q. If a 10Ω resistor carries a current of 5A, what is the voltage across the resistor? (2023)

A. 10V
B. 20V
C. 30V
D. 50V

Solution

Using Ohm's Law, V = I * R = 5A * 10Ω = 50V.

Correct Answer: B — 20V

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Q. If a 10Ω resistor is connected across a 20V battery, what is the power dissipated in the resistor? (2023)

A. 20W
B. 40W
C. 10W
D. 5W

Solution

Power (P) can be calculated using the formula P = V^2 / R. Here, P = 20^2 / 10 = 400 / 10 = 40W.

Correct Answer: B — 40W

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Q. If a 10Ω resistor is connected to a 20V battery, what is the power consumed by the resistor? (2023)

A. 20W
B. 40W
C. 10W
D. 5W

Solution

Power (P) can be calculated using the formula P = V^2 / R. Here, P = 20V^2 / 10Ω = 40W.

Correct Answer: B — 40W

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Q. If a 5Ω resistor is connected to a 15V battery, what is the power dissipated by the resistor? (2023)

A. 15W
B. 20W
C. 25W
D. 30W

Solution

Power (P) can be calculated using P = V^2 / R. Here, P = 15V^2 / 5Ω = 45W.

Correct Answer: C — 25W

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Q. If a circuit has a current of 5 A and a resistance of 10 ohms, what is the voltage across the circuit? (2019)

A. 15 V
B. 50 V
C. 5 V
D. 10 V

Solution

Using Ohm's Law, V = I * R = 5 A * 10 Ω = 50 V.

Correct Answer: B — 50 V

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Q. If a circuit has a current of 5A and a resistance of 10Ω, what is the voltage across the resistor? (2022)

A. 10V
B. 20V
C. 30V
D. 50V

Solution

Using Ohm's Law, V = I * R = 5A * 10Ω = 50V.

Correct Answer: B — 20V

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Q. If a circuit has a resistance of 12Ω and a current of 3A, what is the power consumed in the circuit? (2022)

A. 36W
B. 24W
C. 12W
D. 9W

Solution

Power (P) can be calculated using the formula P = I^2 * R = (3A)^2 * 12Ω = 36W.

Correct Answer: A — 36W

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Q. If a circuit has a total voltage of 24V and a total resistance of 6Ω, what is the total current in the circuit? (2022)

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. If a circuit has a voltage of 24V and a current of 3A, what is the resistance? (2022)

A. 4Ω
B. 6Ω
C. 8Ω
D. 12Ω

Solution

Using Ohm's Law, R = V / I = 24V / 3A = 8Ω.

Correct Answer: B — 6Ω

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Q. If a circuit has a voltage of 24V and a current of 6A, what is the resistance? (2022)

A. 2Ω
B. 4Ω
C. 6Ω
D. 8Ω

Solution

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

Correct Answer: D — 8Ω

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Q. If a resistor has a current of 2A flowing through it and a voltage of 10V across it, what is the resistance? (2023)

A. 2Ω
B. 5Ω
C. 10Ω
D. 20Ω

Solution

Using Ohm's Law, R = V / I = 10V / 2A = 5Ω.

Correct Answer: B — 5Ω

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Q. If a resistor has a resistance of 10Ω and a current of 2A flows through it, what is the voltage across the resistor? (2023)

A. 5V
B. 10V
C. 20V
D. 30V

Solution

Using Ohm's Law, V = I * R = 2A * 10Ω = 20V.

Correct Answer: C — 20V

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Q. If a resistor has a resistance of 10Ω and a current of 5A flows through it, what is the voltage across the resistor? (2023)

A. 10V
B. 20V
C. 30V
D. 50V

Solution

Using Ohm's Law, V = I * R = 5A * 10Ω = 50V.

Correct Answer: B — 20V

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Q. If a resistor has a resistance of 8Ω and the current flowing through it is 4A, what is the power dissipated by the resistor? (2022)

A. 16W
B. 32W
C. 64W
D. 8W

Solution

Power (P) can be calculated using P = I^2 * R = (4A)^2 * 8Ω = 16 * 8 = 128W.

Correct Answer: B — 32W

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Q. If a resistor has a resistance of 8Ω and the current flowing through it is 4A, what is the voltage across the resistor? (2022)

A. 32V
B. 16V
C. 8V
D. 4V

Solution

Using Ohm's Law, V = I * R = 4A * 8Ω = 32V.

Correct Answer: B — 16V

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Q. If the current flowing through a conductor is 3A and the resistance is 2Ω, what is the voltage across the conductor? (2023)

A. 1.5V
B. 3V
C. 6V
D. 9V

Solution

Using Ohm's Law, V = I * R = 3A * 2Ω = 6V.

Correct Answer: C — 6V

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Q. If the current flowing through a conductor is 3A and the resistance is 6Ω, what is the voltage across the conductor? (2023)

A. 9V
B. 18V
C. 3V
D. 6V

Solution

Using Ohm's Law, V = I * R = 3A * 6Ω = 18V.

Correct Answer: A — 9V

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Q. If the current flowing through a resistor is 2A and the voltage across it is 6V, what is the resistance? (2022)

A. 3Ω
B. 2Ω
C. 6Ω
D. 12Ω

Solution

Using Ohm's Law, R = V / I = 6V / 2A = 3Ω.

Correct Answer: A — 3Ω

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Q. If the current flowing through a resistor is 3A and the voltage across it is 9V, what is the resistance? (2022)

A. 1Ω
B. 2Ω
C. 3Ω
D. 4Ω

Solution

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

Correct Answer: C — 3Ω

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Q. If the current through a resistor is 5A and the resistance is 10Ω, what is the voltage across the resistor? (2022)

A. 50V
B. 5V
C. 10V
D. 15V

Solution

Using Ohm's Law, V = I * R = 5A * 10Ω = 50V.

Correct Answer: A — 50V

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Q. If the resistance of a conductor is doubled while the voltage remains constant, what happens to the current? (2020)

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

Solution

According to Ohm's Law, if the resistance (R) is doubled and the voltage (V) remains constant, the current (I) will be halved (I = V/R).

Correct Answer: B — It halves

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Q. In a circuit with a 24V battery and a 6Ω resistor, what is the power consumed by the resistor? (2020)

A. 48W
B. 72W
C. 96W
D. 144W

Solution

Power (P) can be calculated using P = V^2 / R. Here, P = 24V^2 / 6Ω = 96W.

Correct Answer: B — 72W

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Q. In a circuit with a voltage of 24V and a current of 6A, what is the resistance? (2020)

A. 2Ω
B. 4Ω
C. 6Ω
D. 8Ω

Solution

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

Correct Answer: D — 8Ω

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Showing 1 to 30 of 41 (2 Pages)

Current Electricity - Ohms Law

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