First slide

Power

Question

If a machine perform 4000 J output work and 1000 J is inside loss due to friction, then find the efficiency.

Moderate

A

80%
B

30%
C

25%
D

60%

Solution

$∵$ Efficiency $= \frac{W_{0}}{W_{i}} \times 100$
Given, $W_{0} = 4000 J and r γ_{i} = 4000 + 1000 = 5000 J$
$∵$ EffIciency $(η) = \frac{4000}{5000} \times 100 = 80 %$

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