If we keep a new battery in a toy car it moves more fast , if we place a new battery in a torch it glows more bright but if we place an old battery or new one, clock rotates at same speed , do u know WHY??
The common analogue wall clock running from one or two AA cells uses a stepping motor to drive the hands. This motor can step at 60 steps per revolution. It uses coils and magnets. An electronic circuit uses a quartz crystal usually at 32767Hz for the time reference. This is divided by 32767 using an electronic counter to get precisely timed 1 second pulses that drive the stepping motor. The stepping motor drives the seconds hand, and the minutes and hours hands are geared to the seconds hand so one revolution divides by 60 for minutes and 60 again for hours, using the gears. The hands are driven by separate "coaxial" shafts on the same center.
Other (older style) mechanical clocks work using a pendulum and/or escapement to regulate the time, controlling the rotation of the gears driving the hands, with weights or a spring to provide the energy turning the gears
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