Current Electricity - Circuits for Competitive Exams

Current Electricity - Circuits

Q. A circuit contains a 12V battery and two resistors of 4Ω and 6Ω in parallel. What is the total current supplied by the battery? (2019)

A. 1.2 A
B. 2 A
C. 3 A
D. 4 A

Solution

First, find the equivalent resistance R_eq = 1/(1/4 + 1/6) = 2.4Ω. Then, I = V/R_eq = 12V/2.4Ω = 5 A.

Correct Answer: C — 3 A

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Q. A circuit has a 15V battery and a total resistance of 5Ω. What is the total current flowing through the circuit? (2023)

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

Solution

Using Ohm's law, I = V/R = 15V/5Ω = 3A.

Correct Answer: C — 3A

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Q. A circuit has a 9V battery and a 3Ω resistor. What is the voltage drop across the resistor? (2022)

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

Solution

The voltage drop across the resistor is equal to the battery voltage in a simple circuit: 9V.

Correct Answer: C — 9V

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Q. If a circuit has a 12V battery and a total resistance of 3Ω, what is the power consumed by the circuit? (2023)

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

Solution

Power P = V^2/R = 12^2/3 = 144/3 = 48W.

Correct Answer: B — 24W

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Q. If a circuit has a total resistance of 10Ω and a current of 3A, what is the voltage across the circuit? (2021)

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

Solution

Using Ohm's law, V = I * R = 3A * 10Ω = 30V.

Correct Answer: C — 30V

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Q. If a circuit has a total resistance of 12Ω and a current of 2A, what is the total voltage in the circuit? (2023)

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

Solution

Using Ohm's law, V = I * R = 2A * 12Ω = 24V.

Correct Answer: B — 24V

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Q. If a circuit has a total resistance of 12Ω and a current of 2A, what is the voltage across the circuit? (2020)

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

Solution

Using Ohm's law, V = I * R = 2A * 12Ω = 24V.

Correct Answer: B — 24V

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Q. If a circuit has a total resistance of 12Ω and a current of 3A, what is the voltage across the circuit? (2023)

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

Solution

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

Correct Answer: B — 36V

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Q. If a circuit has a total resistance of 8Ω and a current of 2A flows through it, what is the voltage across the circuit? (2020)

A. 4V
B. 8V
C. 12V
D. 16V

Solution

Using Ohm's law, V = I * R = 2A * 8Ω = 16V.

Correct Answer: B — 8V

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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 flowing through the circuit? (2023)

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 total voltage of 24V and a total resistance of 6Ω, what is the current flowing through the circuit? (2023)

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

Solution

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

Correct Answer: A — 4A

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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? (2020)

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 total voltage of 24V and a total resistance of 8Ω, what is the total current? (2020)

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

Solution

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

Correct Answer: C — 4A

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Q. If a circuit has a total voltage of 24V and a total resistance of 8Ω, what is the total current flowing through the circuit? (2023)

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

Solution

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

Correct Answer: C — 4A

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Q. If the voltage across a resistor is increased from 5V to 10V, what happens to the current through the resistor if the resistance is constant? (2021)

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

Solution

According to Ohm's law, if voltage increases and resistance remains constant, current will also increase proportionally.

Correct Answer: A — It doubles

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Q. If two resistors of 4Ω and 12Ω are connected in series, what is the total voltage across them if the current flowing is 2A? (2020)

A. 32V
B. 24V
C. 16V
D. 8V

Solution

Total resistance R = 4Ω + 12Ω = 16Ω. Voltage V = I * R = 2A * 16Ω = 32V.

Correct Answer: B — 24V

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Q. If two resistors of 4Ω and 6Ω are connected in parallel, what is the equivalent resistance? (2022)

A. 2.4Ω
B. 10Ω
C. 24Ω
D. 1.5Ω

Solution

Using the formula for parallel resistors, 1/R_eq = 1/R1 + 1/R2 = 1/4 + 1/6 = 5/12, R_eq = 12/5 = 2.4Ω.

Correct Answer: A — 2.4Ω

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Q. If two resistors of 5Ω and 10Ω are connected in series, what is the total resistance? (2021)

A. 5Ω
B. 10Ω
C. 15Ω
D. 20Ω

Solution

In series, R_total = R1 + R2 = 5Ω + 10Ω = 15Ω.

Correct Answer: C — 15Ω

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Q. In a circuit with a 10Ω resistor and a 5V battery, what is the power consumed by the resistor? (2023)

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

Solution

Power P = V^2/R = 5^2/10 = 25/10 = 2.5W.

Correct Answer: B — 2W

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Q. In a circuit with a 10Ω resistor and a 5Ω resistor in series, what is the total voltage across the circuit if the current is 2A? (2023)

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

Solution

Total resistance R = 10Ω + 5Ω = 15Ω. Voltage V = I * R = 2A * 15Ω = 30V.

Correct Answer: B — 20V

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Q. In a circuit with a 12V battery and two 4Ω resistors in series, what is the current flowing through the circuit? (2023)

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

Solution

Total resistance R = 4Ω + 4Ω = 8Ω. Current I = V/R = 12V/8Ω = 1.5A.

Correct Answer: B — 2A

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Q. In a circuit with a 15V battery and a 5Ω resistor, what is the voltage drop across the resistor? (2019)

A. 3V
B. 5V
C. 15V
D. 0V

Solution

The voltage drop across the resistor is equal to the battery voltage, which is 15V.

Correct Answer: C — 15V

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Q. In a circuit with a 15V battery and two resistors of 5Ω and 10Ω in series, what is the voltage drop across the 10Ω resistor? (2022)

A. 5V
B. 10V
C. 15V
D. 0V

Solution

The total resistance is 15Ω. The current I = V/R = 15V/15Ω = 1A. Voltage drop across 10Ω = I * R = 1A * 10Ω = 10V.

Correct Answer: B — 10V

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Q. In a circuit with a 24V battery and a total resistance of 8Ω, what is the power consumed by the circuit? (2023)

A. 72 W
B. 48 W
C. 36 W
D. 24 W

Solution

Power P = V^2/R = 24^2/8 = 576/8 = 72 W.

Correct Answer: B — 48 W

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Q. In a circuit with a 9V battery and two resistors of 3Ω and 6Ω in series, what is the voltage across the 6Ω resistor? (2022)

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

Solution

Total resistance R_total = 3Ω + 6Ω = 9Ω. Current I = V/R_total = 9V/9Ω = 1A. Voltage across 6Ω = I * R = 1A * 6Ω = 6V.

Correct Answer: B — 6V

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Q. In a circuit with a 9V battery and two resistors of 3Ω and 6Ω in series, what is the current flowing through the circuit? (2022)

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

Solution

Total resistance R = 3Ω + 6Ω = 9Ω. Current I = V/R = 9V/9Ω = 1A.

Correct Answer: B — 2A

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Q. In a circuit, if the resistance is doubled while the voltage remains constant, what happens to the current? (2021)

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

Solution

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

Correct Answer: B — It halves

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

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

Solution

According to Ohm's law, if V is tripled, I will also triple.

Correct Answer: A — It triples

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Q. In a series circuit with a 12V battery and two resistors of 4Ω and 8Ω, what is the voltage across the 8Ω resistor? (2022)

A. 4V
B. 6V
C. 8V
D. 12V

Solution

Total resistance R_total = 4Ω + 8Ω = 12Ω. Current I = V/R_total = 12V/12Ω = 1A. Voltage across 8Ω = I * R = 1A * 8Ω = 8V.

Correct Answer: B — 6V

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Q. In a series circuit with a 9V battery and three resistors of 1Ω, 2Ω, and 3Ω, what is the total resistance? (2019)

A. 6Ω
B. 5Ω
C. 4Ω
D. 3Ω

Solution

Total resistance in series is R_total = R1 + R2 + R3 = 1 + 2 + 3 = 6Ω.

Correct Answer: A — 6Ω

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Showing 1 to 30 of 48 (2 Pages)

Current Electricity - Circuits

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