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)
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)
Solution
Total resistance in series is R_total = R1 + R2 + R3 = 1 + 2 + 3 = 6Ω.
Correct Answer: A — 6Ω
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Q. In a series circuit, if one resistor fails, what happens to the current in the circuit? (2019)
-
A.
It increases
-
B.
It decreases
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C.
It stops
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D.
It remains the same
Solution
In a series circuit, if one resistor fails, the circuit is broken and the current stops.
Correct Answer: C — It stops
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Q. In a series circuit, if the resistance is doubled, what happens to the current flowing through the circuit? (2021)
-
A.
It doubles
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B.
It halves
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C.
It remains the same
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D.
It becomes zero
Solution
According to Ohm's law, I = V/R. If R is doubled, the current I will be halved for a constant voltage V.
Correct Answer: B — It halves
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Q. What is the current flowing through a 10Ω resistor connected to a 20V battery? (2021)
-
A.
1 A
-
B.
2 A
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C.
3 A
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D.
4 A
Solution
Using Ohm's law, I = V/R = 20V/10Ω = 2 A.
Correct Answer: B — 2 A
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Q. What is the effect on total resistance when more resistors are added in parallel? (2022)
-
A.
It increases
-
B.
It decreases
-
C.
It remains the same
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D.
It becomes zero
Solution
Adding resistors in parallel decreases the total resistance.
Correct Answer: B — It decreases
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Q. What is the equivalent resistance of three resistors of 2 ohms each connected in series? (2020)
-
A.
2 ohms
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B.
4 ohms
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C.
6 ohms
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D.
8 ohms
Solution
In series, the equivalent resistance is the sum of the individual resistances: R_eq = R1 + R2 + R3 = 2 + 2 + 2 = 6 ohms.
Correct Answer: C — 6 ohms
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Q. What is the equivalent resistance of two 10Ω resistors connected in series? (2022)
-
A.
5Ω
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B.
10Ω
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C.
20Ω
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D.
15Ω
Solution
In series, R_eq = R1 + R2 = 10 + 10 = 20Ω.
Correct Answer: C — 20Ω
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Q. What is the equivalent resistance of two 12Ω resistors connected in series? (2019)
-
A.
6Ω
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B.
12Ω
-
C.
24Ω
-
D.
18Ω
Solution
In series, R_eq = R1 + R2 = 12Ω + 12Ω = 24Ω.
Correct Answer: C — 24Ω
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Q. What is the equivalent resistance of two resistors of 8Ω and 12Ω connected in series? (2019)
-
A.
20Ω
-
B.
24Ω
-
C.
16Ω
-
D.
10Ω
Solution
In series, R_eq = R1 + R2 = 8Ω + 12Ω = 20Ω.
Correct Answer: A — 20Ω
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Q. What is the equivalent resistance of two resistors of 8Ω and 4Ω connected in series? (2022)
-
A.
12Ω
-
B.
32Ω
-
C.
2Ω
-
D.
8Ω
Solution
In series, R_eq = R1 + R2 = 8Ω + 4Ω = 12Ω.
Correct Answer: A — 12Ω
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Q. What is the power consumed by a 10Ω resistor when a current of 3A flows through it? (2021)
-
A.
90W
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B.
30W
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C.
60W
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D.
45W
Solution
Power P = I^2 * R = (3A)^2 * 10Ω = 9 * 10 = 90W.
Correct Answer: A — 90W
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Q. What is the power consumed by a resistor of 10 ohms carrying a current of 2 A? (2023)
-
A.
20 W
-
B.
40 W
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C.
10 W
-
D.
5 W
Solution
Power P = I^2 * R = (2 A)^2 * 10 Ω = 4 * 10 = 40 W.
Correct Answer: A — 20 W
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Q. What is the total current flowing in a circuit with a 9V battery and a total resistance of 3 ohms? (2020)
-
A.
1 A
-
B.
2 A
-
C.
3 A
-
D.
4 A
Solution
Using Ohm's law, I = V/R = 9V / 3Ω = 3 A.
Correct Answer: B — 2 A
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Q. What is the total current in a circuit with a 10Ω resistor and a 5Ω resistor in series connected to a 30V battery? (2021)
Solution
Total resistance R = 10Ω + 5Ω = 15Ω. Current I = V/R = 30V/15Ω = 2A.
Correct Answer: B — 3A
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Q. What is the total current in a circuit with a 12V battery and two 6Ω resistors in series? (2021)
Solution
Total resistance R = 6 + 6 = 12Ω. Current I = V/R = 12V/12Ω = 1A.
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 series? (2021)
Solution
Total resistance R = 3Ω + 3Ω = 6Ω. Current I = V/R = 9V/6Ω = 1.5A.
Correct Answer: A — 1A
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Q. What is the total current in a circuit with two branches, one carrying 2A and the other 3A? (2021)
Solution
In parallel circuits, the total current is the sum of the currents in each branch: 2A + 3A = 5A.
Correct Answer: A — 5A
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Q. What is the total current in a circuit with two branches, one carrying 3A and the other 5A? (2021)
Solution
In parallel circuits, the total current is the sum of the currents in each branch: 3A + 5A = 8A.
Correct Answer: D — 8A
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Q. What is the voltage across a 10Ω resistor carrying a current of 2A? (2022)
-
A.
5V
-
B.
10V
-
C.
15V
-
D.
20V
Solution
Using Ohm's law, V = I * R = 2A * 10Ω = 20V.
Correct Answer: B — 10V
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Q. What is the voltage drop across a 10Ω resistor carrying a current of 2A? (2019)
-
A.
5V
-
B.
10V
-
C.
15V
-
D.
20V
Solution
Using Ohm's law, V = I * R = 2A * 10Ω = 20V.
Correct Answer: B — 10V
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Q. What is the voltage drop across a 3Ω resistor carrying a current of 4A? (2019)
-
A.
6V
-
B.
8V
-
C.
12V
-
D.
15V
Solution
Using Ohm's law, V = I * R = 4A * 3Ω = 12V.
Correct Answer: C — 12V
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