Electrical Energy and Power NEET Questions

Physics - Current Electricity

Electrical Energy and Power MCQ Questions


13.
Which of the following is a correct expression of electrical energy?
A.
E = V²R
B.
E = P/t
C.
E = Pt
D.
E = IR
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ANSWER :
C. E = Pt
14.
An electric iron of 1000W is used for 2 hours. What is the energy consumed?
A.
2 kWh
B.
0.2 kWh
C.
20 kWh
D.
2000 kWh
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ANSWER :
A. 2 kWh
15.
The unit of electrical energy used by power companies is:
A.
Kilowatt-hour
B.
Joule
C.
Watt
D.
Ampere-hour
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ANSWER :
A. Kilowatt-hour
16.
What is the relationship between power and energy?
A.
Power = Energy/Time
B.
Power = Energy × Time
C.
Power = Energy²
D.
Power = Time/Energy
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ANSWER :
A. Power = Energy/Time
17.

An infinitely long straight conductor carries a current of 5 A as shown. An electron is moving with a speed of 105 m/s parallel to the conductor. The perpendicular distance between the electron and the conductor is 20 cm at an instant. Calculate the magnitude of the force experienced by the electron at that instant.

NEET - 2021

A.

4 × 10–20 N

B.

8π × 10–20 N

C.

4π × 10–20 N

D.

8 × 10–20 N

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ANSWER :

D. 8 × 10–20 N