Question

If a car engine accomplishes 4000 joules of work but burns gas equivalent to 16000 joules of energy, what is the efficiency of the engine

Answer 1

16,000/4,000=4*100= 400

Answer: 400

Answer 2

Answer:

The efficiency of the engine is 25%.

Explanation:

Given that,

Output energy = 4000 J

Input energy = 16000 J

The efficiency of the engine is equal to the output energy divided input energy.

Formula of the efficiency is defined as,

$\eta =\dfrac{Output\ energy}{Input\ energy}\times100$

$\eta=\dfrac{4000}{16000}\times100$

$\eta=0.025\times100$

$\eta=25\%$

Hence, The efficiency of the engine is 25%.