Calculate How much energy is transferred as useful energy

=A 98% efficient kettle that has a total input of 2000J

"Efficiency" just means that's how much of the input energy comes out useful.

For this kettle, it's 98%. That means that whatever amount of energy you put into the kettle, 98% of it comes out useful.

98% of 2,000 Joules is (0.98) x (2000J). That's 1,960 Joules.

Answer:1960j

Explanation:

total input energy=2000j

98% of total input energy is useful

98% of 2000

98/100 x 2000

(98 x 2000) ➗ 100

196000 ➗ 100=1960

1960j is useful