Question

an electric refrigerator rated 400 w operates 8 hours a day. calculate the energy per day in kwh and s.i. units

Answer 1

The energy consumed by the refrigerator can be calculated by multiplying its power rating, in watts, by the number of hours it operates per day. In this case, the refrigerator is rated at 400 watts and operates for 8 hours per day. So, the energy consumed per day is 3.2 kilowatt-hours (kWh) or 3200 watt-hours (Wh) in S.I. units.

Step-by-step explanation:

The energy consumed by the refrigerator can be calculated by multiplying its power rating, in watts, by the number of hours it operates per day. In this case, the refrigerator is rated at 400 watts and operates for 8 hours per day. So, the energy consumed per day in kilowatt-hours (kWh) is calculated as follows:

Energy (kWh) = Power (W) x Time (h)

Energy (kWh) = 400 W x 8 h = 3200 Wh = 3.2 kWh

In S.I. units, the energy consumed per day is 3200 watt-hours (Wh) or 3.2 kilojoules (kJ).