Question

4 appliances of 500 watt each are used for 10 hours, find the energy consumed in kWh. Also the work done in joules

Answer 1

Solution:

Energy used by one appliance in 1 hour = 500 W;

Energy used by four appliances in 1 hour = 500 * 4 = 2000 W; = 2 KW

Total energy used in 10 hours = 2 * 10 = 20 Kwh;

Total energy consumes in kwh = 20 kwh

Now, find work done in Joule;

Work Done, W = ?

W = P * t;

1 kwh = 3600000 J

Then,

20 kwh = 72,00,0000 J

Total Work Done = 720,00,000 J