Question

an electrical heater of 400 watts works for 2 hours. find the electrical energy units consumed in a day

Answer 1

Power=400W
time=2hrs.
power=energy/time
400=energy/2
energy=400*2=800J
 energy consumed in a day:
time=24hrs
energy=400*24=9600J

Answer 2

Given:

The power consumed by the electric heater = 400 watts

The time for which the electric heater works = 2 hours

To find:

The electrical energy units consumed by the electrical heater in one day.

Solution:

We know that the formula of energy consumed in terms of power is as follows:

Energy = Power × time

On substituting the given values in the formula, we get:

Energy = 400 × 2 = 800 Wh

Thus, the power consumed by the electrical heater will be 800 Wh.