In an electrical circuit a cell pushes the electrons around the circuit.
It does this by transferring chemical energy from the (chemical) materials in the
cell to electrical potential energy of/for the electrons.
When electrons
pass through an electric device, say a motor; in the circuit they lose some of the electrical
potential energy to the thin wires in the charger in the form of heat and electricity.
Therefore across the circuit there is an electrical
energy difference.
The electrons entering the motor have a higher
amount of electric potential energy than the electrons leaving the motor.
This
difference in electrical potential energy across the charger is called a
Potential Differences.
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