Question

Am electric bulb is rated 250V,8A.If this bulb is used for 2.0 hours,calculate the amount of energy consumed.?

Answer 1

Answer:4000joules.

Explanation: Energy=power*time.

Now Power=Voltage*current

Now since Energy=power*time

We can write Energy=Voltage*current*time.

Now the Voltage supplied by the bulb, i.e the potential difference is 250V

It runs for 2 hours

And gives 8Amperes of current.

Hence energy is 250*2*8=4000 joules