Question

What is the efficiency of a machine if your work on the machine is 1200 j and the machines output work is 300 j?

Answer 1

Answer:

The efificiency is 0,25 of the machine  (25%). See the explanation below

Explanation:

We calculate the efficiency with this formula:

Efficiency = energy obtained/energy supplied= 300 Joule/1200 Joule

Efficiency= 0,25

Efficiency(%) = 0,25 x100 = 25%

Answer 2

Answer:  

The efficiency of the machine is 25%.  

Explanation:  

Efficiency is defined as the ratio of work done to the total energy supplied. Here, we know that the energy obtained or work done by a machine is 300J and the energy supplied to the machine is 1200J

We know that, $\text { Efficiency }=\frac{\text { work done }}{\text { energy supplied }}=\frac{300}{1200}=0.25(\%)=0.25 \times 100=25 \%$

Hence efficiency of the machine is 25%.