Question

A machine is said to have low efficiency if it experiences a lot of energy loss to heat. How can a machine be made more efficient?

a
by increasing electrical energy
b
by reducing magnetic energy
c
by reducing friction
d
by increasing gravity

Answer 1

C) By reducing friction. Friction causes energy loss in a machine, so by reducing friction, the energy loss will also be reduced, resulting in a more efficient machine. Other ways to improve a machine's efficiency could include improving insulation, reducing resistance, or improving the design of the machine.