An electric motor receives a total energy of $E$. A quantity of energy $Q$ is wasted, and the rest is used to do useful work. What is the efficiency of the motor?
- A$\frac{Q}{E}$
- B$\left(\frac{Q}{E}\right)-1$
- C$1-\left(\frac{Q}{E}\right)$
- D$\frac{(1-Q)}{E}$