Q. What is the potential energy stored in a spring when it is compressed by a distance x?
-
A.
1/2 kx
-
B.
1/2 kx²
-
C.
kx
-
D.
kx²
Solution
The potential energy (PE) stored in a spring is given by PE = 1/2 kx², where k is the spring constant and x is the displacement.
Correct Answer: B — 1/2 kx²
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Q. What is the power consumed by a 10 ohm resistor when a current of 2 A flows through it?
-
A.
20 W
-
B.
40 W
-
C.
10 W
-
D.
5 W
Solution
Power P = I^2 * R = (2 A)^2 * 10Ω = 4 * 10 = 40 W.
Correct Answer: B — 40 W
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Q. What is the power consumed by a 10 ohm resistor when a current of 3 A flows through it?
-
A.
30 W
-
B.
90 W
-
C.
60 W
-
D.
15 W
Solution
Power P = I^2 * R = (3 A)^2 * 10 ohms = 9 * 10 = 90 W.
Correct Answer: B — 90 W
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Q. What is the power consumed by a 100Ω resistor when a current of 0.5A flows through it? (2020)
-
A.
25W
-
B.
50W
-
C.
100W
-
D.
12.5W
Solution
Power (P) is given by P = I^2R = (0.5A)^2 * 100Ω = 0.25 * 100 = 25W.
Correct Answer: A — 25W
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Q. What is the power consumed by a 10Ω resistor when a current of 2A flows through it?
-
A.
20W
-
B.
40W
-
C.
10W
-
D.
5W
Solution
Power P = I^2 * R = (2A)^2 * 10Ω = 4A^2 * 10Ω = 40W.
Correct Answer: A — 20W
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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
-
B.
30W
-
C.
60W
-
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 12 V battery supplying a current of 2 A?
-
A.
24 W
-
B.
12 W
-
C.
6 W
-
D.
48 W
Solution
Power is given by P = V * I = 12 V * 2 A = 24 W.
Correct Answer: A — 24 W
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Q. What is the power consumed by a 5 ohm resistor carrying a current of 3 A?
-
A.
15 W
-
B.
9 W
-
C.
5 W
-
D.
3 W
Solution
Power P = I^2 * R = (3 A)^2 * 5 ohms = 9 * 5 = 45 W.
Correct Answer: A — 15 W
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Q. What is the power consumed by a 5 ohm resistor when a current of 2A flows through it?
-
A.
10W
-
B.
20W
-
C.
5W
-
D.
15W
Solution
Power P = I^2 * R = (2A)^2 * 5 ohms = 4 * 5 = 20W.
Correct Answer: B — 20W
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Q. What is the power consumed by a 5 ohm resistor when a current of 3 A flows through it?
-
A.
15 W
-
B.
9 W
-
C.
5 W
-
D.
3 W
Solution
Power P = I^2 * R = (3 A)^2 * 5 ohms = 9 * 5 = 45 W.
Correct Answer: A — 15 W
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Q. What is the power consumed by a 6Ω resistor when a current of 2A flows through it? (2023)
-
A.
12W
-
B.
24W
-
C.
6W
-
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 power consumed by a 6Ω resistor when a current of 3A flows through it? (2021)
-
A.
18W
-
B.
9W
-
C.
36W
-
D.
12W
Solution
Power (P) is given by P = I^2 * R = (3A)^2 * 6Ω = 9 * 6 = 54W.
Correct Answer: A — 18W
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Q. What is the power consumed by a device that operates at a voltage of 120 volts and draws a current of 3 amperes?
-
A.
360 watts
-
B.
40 watts
-
C.
120 watts
-
D.
240 watts
Solution
Power (P) is calculated as P = V * I. Thus, P = 120 V * 3 A = 360 W.
Correct Answer: A — 360 watts
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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
-
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 power consumed in an AC circuit with a voltage of 230V and a current of 5A with a power factor of 0.8? (2023)
-
A.
920W
-
B.
1150W
-
C.
115W
-
D.
460W
Solution
Power = V × I × Power Factor = 230V × 5A × 0.8 = 920W.
Correct Answer: A — 920W
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Q. What is the power dissipated in a 10Ω resistor carrying a current of 2A?
-
A.
20W
-
B.
30W
-
C.
40W
-
D.
50W
Solution
Power P = I^2 * R = (2A)^2 * 10Ω = 4 * 10 = 40W.
Correct Answer: A — 20W
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Q. What is the power dissipated in a 4 ohm resistor carrying a current of 3 A?
-
A.
12 W
-
B.
9 W
-
C.
6 W
-
D.
3 W
Solution
Using the power formula P = I^2 * R, we have P = (3 A)^2 * 4 ohms = 9 * 4 = 36 W.
Correct Answer: A — 12 W
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Q. What is the power dissipated in a resistor of 10 ohms carrying a current of 2 A?
-
A.
20 W
-
B.
10 W
-
C.
5 W
-
D.
40 W
Solution
Using the power formula P = I^2 * R, we have P = (2 A)^2 * 10 ohms = 4 * 10 = 40 W.
Correct Answer: A — 20 W
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Q. What is the power dissipated in a resistor of 5Ω carrying a current of 2A?
-
A.
5W
-
B.
10W
-
C.
20W
-
D.
40W
Solution
Power is given by P = I^2 * R = (2A)^2 * 5Ω = 4A^2 * 5Ω = 20W.
Correct Answer: B — 10W
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Q. What is the power dissipated in a resistor of 5Ω carrying a current of 3A?
Solution
Power P = I^2 * R = (3A)^2 * 5Ω = 9A^2 * 5Ω = 45W.
Correct Answer: A — 15W
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Q. What is the power dissipated in a resistor of 8Ω when a current of 2A flows through it?
-
A.
4W
-
B.
8W
-
C.
16W
-
D.
32W
Solution
Power P = I^2 * R = (2A)^2 * 8Ω = 4A^2 * 8Ω = 32W.
Correct Answer: C — 16W
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Q. What is the power factor in a circuit with a phase angle of 60 degrees?
-
A.
0.5
-
B.
0.866
-
C.
1
-
D.
0
Solution
The power factor is cos(60°) = 0.5.
Correct Answer: B — 0.866
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Q. What is the power factor in a circuit with a resistance of 5 ohms and a reactance of 5 ohms? (2022)
Solution
Power factor = R/Z = 5/√(5² + 5²) = 5/√50 = √2/2.
Correct Answer: D — √2/2
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Q. What is the power factor in an AC circuit with a phase angle of 30 degrees? (2022)
-
A.
0.5
-
B.
0.866
-
C.
1
-
D.
0.707
Solution
The power factor is cos(30°) = √3/2 ≈ 0.866.
Correct Answer: B — 0.866
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Q. What is the power factor of a circuit with a phase angle of 60 degrees?
-
A.
0.5
-
B.
0.866
-
C.
1
-
D.
0.707
Solution
The power factor (PF) is given by cos(θ). For a phase angle of 60 degrees, PF = cos(60°) = 0.5.
Correct Answer: B — 0.866
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Q. What is the power factor of a circuit with a resistance of 30Ω and a reactance of 40Ω? (2023)
-
A.
0.6
-
B.
0.75
-
C.
0.8
-
D.
1.0
Solution
Power factor = R/Z where Z = √(R² + X²). Calculate.
Correct Answer: A — 0.6
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Q. What is the power factor of a circuit with a resistance of 4Ω and a reactance of 3Ω? (2021)
-
A.
0.6
-
B.
0.8
-
C.
1.0
-
D.
0.75
Solution
Power factor = R/Z = R/√(R² + X²) = 4/√(4² + 3²) = 4/5 = 0.8.
Correct Answer: A — 0.6
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Q. What is the power factor of a circuit with a resistance of 5 ohms and a reactance of 5 ohms? (2022)
Solution
Power factor = R/Z = 5/√(5² + 5²) = 5/√50 = √2/2.
Correct Answer: D — √2/2
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Q. What is the power factor of a circuit with a resistance of 5Ω and an inductive reactance of 5Ω? (2022)
-
A.
0.5
-
B.
0.707
-
C.
1
-
D.
0
Solution
Power factor = R/Z = 5 / √(5² + 5²) = 5 / √50 = 0.707.
Correct Answer: B — 0.707
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Q. What is the power factor of a circuit with a resistance of 6Ω and a reactance of 8Ω? (2022)
-
A.
0.75
-
B.
0.8
-
C.
0.6
-
D.
1.0
Solution
Power factor = R/Z = R/√(R² + X²) = 6/√(6² + 8²) = 6/10 = 0.6.
Correct Answer: B — 0.8
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