Current Electricity
Q. What is the current through a 12Ω resistor when a voltage of 48V is applied? (2023)
Solution
Using Ohm's law, I = V/R = 48V / 12Ω = 4A.
Correct Answer: B — 6A
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Q. What is the equivalent resistance of two 4Ω resistors in parallel? (2019)
Solution
Using the formula 1/R_eq = 1/R1 + 1/R2, we get 1/R_eq = 1/4 + 1/4 = 1/2, thus R_eq = 2Ω.
Correct Answer: A — 2Ω
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Q. What is the equivalent resistance of two resistors of 4Ω and 12Ω in parallel? (2022)
Solution
Using the formula 1/R_eq = 1/R1 + 1/R2, we get 1/R_eq = 1/4 + 1/12 = 1/3, so R_eq = 3Ω.
Correct Answer: A — 3Ω
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Q. What is the potential difference across a 5Ω resistor carrying a current of 2A? (2023)
Solution
Using Ohm's law, V = IR = 2A * 5Ω = 10V.
Correct Answer: A — 10V
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Q. What is the power consumed by a 6Ω resistor when a current of 2A flows through it? (2023)
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A.
12W
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B.
24W
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C.
6W
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D.
8W
Solution
Power (P) is given by P = I²R = (2A)² * 6Ω = 4 * 6 = 24W.
Correct Answer: A — 12W
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Q. What is the total current in a circuit with a 15V battery and two 5Ω resistors in series? (2023)
Solution
Total resistance R = 5Ω + 5Ω = 10Ω; I = V/R = 15V / 10Ω = 1.5A.
Correct Answer: B — 2A
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Q. What is the total current in a parallel circuit with two branches carrying 3A and 5A? (2020)
Solution
In a parallel circuit, the total current (I_total) is the sum of the currents in each branch: I_total = 3A + 5A = 8A.
Correct Answer: A — 8A
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Q. What is the total power consumed in a circuit with two 10Ω resistors in series connected to a 20V source? (2020)
-
A.
20W
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B.
40W
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C.
10W
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D.
30W
Solution
Total resistance R = 10Ω + 10Ω = 20Ω. Power P = V²/R = 20² / 20 = 20W.
Correct Answer: B — 40W
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Q. What is the total power consumed in a circuit with two 5Ω resistors in series connected to a 30V battery? (2023)
-
A.
90W
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B.
60W
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C.
30W
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D.
45W
Solution
Total resistance R = 5Ω + 5Ω = 10Ω; Power P = V²/R = 30²/10 = 90W.
Correct Answer: B — 60W
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Q. What is the total resistance of two resistors of 4Ω and 6Ω connected in parallel? (2021)
-
A.
2.4Ω
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B.
10Ω
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C.
24Ω
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D.
1.5Ω
Solution
For parallel resistors, 1/R_eq = 1/R1 + 1/R2 = 1/4 + 1/6. Finding a common denominator gives R_eq = 2.4Ω.
Correct Answer: A — 2.4Ω
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Q. What is the voltage across a 10Ω resistor carrying a current of 3A? (2022)
-
A.
30V
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B.
20V
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C.
10V
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D.
15V
Solution
Using Ohm's law, V = IR = 3A * 10Ω = 30V.
Correct Answer: A — 30V
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Q. What is the voltage across a 12Ω resistor carrying a current of 1.5A? (2023)
-
A.
18V
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B.
12V
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C.
6V
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D.
24V
Solution
Using Ohm's law, V = IR = 1.5A * 12Ω = 18V.
Correct Answer: A — 18V
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Q. What is the voltage across a 12Ω resistor carrying a current of 3A? (2023)
-
A.
36V
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B.
24V
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C.
12V
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D.
18V
Solution
Using Ohm's law, V = IR = 3A * 12Ω = 36V.
Correct Answer: A — 36V
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Q. What is the voltage across a 5Ω resistor carrying a current of 3A? (2023)
-
A.
15V
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B.
10V
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C.
5V
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D.
20V
Solution
Using Ohm's law, V = IR = 3A * 5Ω = 15V.
Correct Answer: A — 15V
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