an electric lamp is marked 100w 220v the resistance of the filament will be
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Answered by
30
We Know,
Power= Voltage × Current
P= VI
100 = 220 × I
I = 100/220
I = 0.45 A
Now,
Voltage = Ampere × Resistance
V = IR
220 = 0.45 × R
R = 220/0.45
R = 488.8888
R = 489 ohms
Power= Voltage × Current
P= VI
100 = 220 × I
I = 100/220
I = 0.45 A
Now,
Voltage = Ampere × Resistance
V = IR
220 = 0.45 × R
R = 220/0.45
R = 488.8888
R = 489 ohms
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1
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