Question

You want to reduce your energy bills.

A.) calculate the power of a light bulb that transfers 6000J every minute.
B.) calculates the power of a different bulb which has a current of 0.05 A through it when there is a potential difference of 240 V through it.
C.) both bulbs are equally bright. Indicate and explain which bulb you should use.

Answer 1

A. 100 Watts

B. 12 Watts

C. the first bulb

Step-by-step explanation:

A. The formula for power is Work done/time

6000J/60seconds = 100J/s or 100W

B. Another formula for power is Current * Voltage

0.05*240 = 12W