Question

(a) What do you understand by the term efficiency of the machine?

(b) A machine has an efficiency of 70 %. Explain the statement as clearly as possible.

Answer 1

(a)

1. The efficiency of a machine indicates how well its input energy is converted to useful output energy or work.
2. It is a major factor in the usefulness of a machine and is the fraction or percentage of the output divided by the input.

(b)

1. If a machine is 70% efficient, it means that 70% of the work input to the machine is obtained as the useful work output.
2. The remaining 30% of the work input has been lost in overcoming the friction and other factors.