Question

An electric refrigerator rated 400W operates 8 hours day . Calculate the energy per day in KWH

Answer 1

Answer:3200Joules

Explanation:

This is because, Formula for energy is power*time.

Joules which is the si unit for energy is expressed as Wsec. As in Watt*sec.

Therefore

Power for refrigerator =400Watts

Time consuming=8 hours.

Hence energy =400*8=320p

Answer 2

Hey mate!! Here's your answer

Answer : Power = 400W

Time = 8 hours

As it is given that give answer in KWh , so, power = 0.4 KW

ATQ, power = energy/time

So, energy = power x time

Energy = 0.4 x 8

Hence, Energy = 3.2 joules