Mechanical power

Question 1

Define power.

Answer 1

The rate of work done with respect to time or the rate of energy transferred with respect to time. P=W/t where P= power (in Watts), W= Work done (in joules) and t= time (in seconds).

Question 2

Define the Watt.

Answer 2

1 Joule per second.

Question 3

Define efficiency.

Answer 3

Efficiency is the ratio of useful energy transferred over total energy supplied, expressed as a percentage. Efficiency = (the useful output energy divided by the total input energy) x100.