Question

A radio set does 20 joules of work in 5 sec. What is its power? How many units of energy consumed if it is operated for 6 hours?

Answer 1

POWER =

$\frac{work \: done}{time \: taken \: }$
$\frac{20 \: \: joules}{5 \: \: sec}$
$= > 4 \: watt$

ENERGY CONSUMED FOR 6 HOURES

=>>>>
$\frac{power \times time}{1000}$

$\frac{4 \times 6 \times 60 \times 60}{1000}$
$\frac{864}{10}$

8.64JOULE

Answer 2

formula of power is work/ time
20/4=5joule is power