Electrical Energy and Power NEET Questions

Physics - Current Electricity

Electrical Energy and Power MCQ Questions


1.
Electrical power dissipated in a resistor of resistance R carrying a current I is given by:
A.
P = I²R
B.
P = I/R²
C.
P = IR
D.
P = I/R
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ANSWER :
A. P = I²R
2.
The SI unit of electrical power is:
A.
Joule
B.
Volt
C.
Watt
D.
Ohm
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ANSWER :
C. Watt
3.
If V is the potential difference across a resistor R and I the current through it, the power dissipated is:
A.
V²/R
B.
VI
C.
All of these
D.
I²R
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ANSWER :
C. All of these
4.
An electric bulb is rated 100 W, 220 V. Its resistance is:
A.
2.2 Ω
B.
220 Ω
C.
100 Ω
D.
484 Ω
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ANSWER :
D. 484 Ω
5.
An electric heater of 1000 W operates at 220 V. The current drawn is approximately:
A.
0.22 A
B.
0.45 A
C.
10 A
D.
4.55 A
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ANSWER :
D. 4.55 A
6.
1 kilowatt-hour (kWh) is equal to:
A.
3.6 × 10⁵ J
B.
3.6 × 10⁷ J
C.
3.6 × 10⁶ J
D.
3.6 × 10³ J
😑 View Answer Rough Work Error
ANSWER :
C. 3.6 × 10⁶ J