Electric Current Test

Result

Electric Current Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

An electric bulb is rated 220 volt - 100 watt. What will be the power consumed by it when operated on 110 volt?

A
75 watt

B
40 watt

C
25 watt

D
50 watt

Solution

100 = (220)²/R
P = (110)2/R
⇒ P = 25 W
Question 2
1 / -0

The resistance of a bulb filament is 100Ω at a temperature of 100°C. If its temperature coefficient of resistance is 0.005 per °C, then its resistance will become 115Ω at a temperature of

A
130°C

B
140°C

C
150°C

D
200°C

Solution

R = R₀(1 + αΔT)
115 = 100[1 + 0.005(T - 100)]
T = 130°C