An electric lamp is marked 220V, 100WIt is used for 5 hours daily calculate- 1) its resistance while glowing.
2) energy consumed in kwh/day?

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Solution

we know that
P = V²/R
so, resistance is given as
R = V²/P
here,
V = 220 volts
P = 100 W
so,
R = 220² / 100
thus, resistance is given as
R = 484 ohms
and
we also have
E = P Ã— t
= 100W Ã— 5h = 500 Wh
or
electrical energy consumed
E = 0.5 kWh

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An electric lamp is marked 220V, 100WIt is used for 5 hours daily calculate- 1) its resistance while glowing.2) energy consumed in kwh/day?

we know thatP = V2/Rso, resistance is given asR = V2/Phere,V = 220 voltsP = 100 Wso,R = 2202 / 100thus, resistance is given asR = 484 ohmsandwe also haveE = P Ã— t= 100W Ã— 5h = 500 Whorelectrical energy consumedE = 0.5 kWh

An electric lamp is marked 220V, 100WIt is used for 5 hours daily calculate- 1) its resistance while glowing.
2) energy consumed in kwh/day?

we know that
P = V²/R
so, resistance is given as
R = V²/P
here,
V = 220 volts
P = 100 W
so,
R = 220² / 100
thus, resistance is given as
R = 484 ohms
and
we also have
E = P Ã— t
= 100W Ã— 5h = 500 Wh
or
electrical energy consumed
E = 0.5 kWh