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Physics 10 Chapter 14 - Current and Electricity - 28
1.
Which of the following formula is true about electric power?
a) P = I x R
b) P = I
2
/ R
c) P = I
2
x R
d) P = I / R
2.
If current I = 10 A and resistance R = 50 Ω. Then find the power P?
a) P = 500 W
b) P = 5 W
c) P = 50 000 W
d) P = 5000 W
3.
What is the unit of power?
a) Newton
b) Joules
c) Ampere
d) Watt
4.
What is the unit of power?
a) Coulomb
b) Ampere
c) Joule per second
d) Newton per square metre
5.
What is the symbol of SI unit of power?
a) C
b) P
c) A
d) W
6.
What is the power of commonly used bulbs in houses?
a) 60 W
b) 25 W
c) All of these
d) 40 W
7.
What is the power of commonly used bulbs in houses?
a) 25 W
b) 75 W
c) All of these
d) 100 W
8.
Which of the following formula is true?
a) V = P / I
b) V = P x I
c) V = Q / I
d) V = I / P
9.
An electric bulb is marked with 220V, 100W. Find the resistance of the filament of the bulb?
a) 848 Ω
b) 484 Ω
c) 51 Ω
d) 15 Ω
10.
The resistance of an electric bulb is 500 Ω. Find the power consumed by the bulb when a potential difference of 250 V is applied across its ends?
a) 125 W
b) 50 W
c) 25.0 W
d) 500 W
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