Q. 244.1( 11 Votes )

Bulb is rated at

Answer :

We know that for an electric appliance

Resistance will be given as

Now, here

P = 100 W

V = 200 volts

So, R =

R =

Thus, resistance of the bulb is R = 400 Ω

Now, electric energy consumed will be

E = power of each unit × time.

E = p × t.


P = 100 W

t = 4 hours


E = 100 x 4 = 400 Watt per hour

Dividing by 1000 to convert into Kilo Watt per hour

E = kWh

Electrical energy consumed is kWh

The total cost of electricity = total unit of energy consumed x cost per unit =

Cost = 0.4kWh x 4 Rs/kWh = Rs1.6

Thus, total cost (daily) = Rs. 1.6

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