Can you tell ?
All of you must have enjoyed sitting on a giant wheel. What makes the giant wheel go round ?

Explanation

In both the examples given above, there is wheel fitted to the axle. The axle of the giant wheel rotates due to electricity. Due to this rotating axis, the wheel starts taking turns. Similarly, the axle of the bicycle moves due to muscular energy, when the pedal is moved. Due to movement of the axle, the wheels of the bicycle also start moving.