Question

An electric bulb of resistance 200 ohm drains a current of 1 A .calculate the power of the bulb and energy in kWh consumed in burning it for 5 hours.

Answer 1

We need to find the voltage .

V= IR
V = 200 volts.

Power = V * I = 200 * 1 = 200 w.
Totally in 5 hours the power consumed Is 200 * 5 = 1000 watt hour.
= 1 k w h.


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Answer 2

The bulb,
volt = 200 ohm,
amp = 1A
Time = 5 hours

according to the question,

1 BOT =
1×200× 5
---------------- -
1000

200
= ---------
200

= 1

hope it can help you to your math.