Question

an electric heater of 4000 W uses 20000 J of energy in a day.
a) Find the time for which it is used in a day.
b) what is the cost of using it for 50 days, if 1 unit costs Rs 6.​

Please help me tomorrow is my exam of science

Answer 1

given,

(a) p=e/t

4000=20000/t

so,t=20000/4000

t=5hrs

(b) 1unit= 1kwh

when 4 kw is used for 5 hrs it will be 20kwh

so,cost=20*6

120 rs

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