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The voltage of a battery measures the strength with which it can ‘push’ current around a circuit.
The voltage of a component in an electric circuit measures the size of ‘push’ that is moving current through it.
The voltage across each component in an electric circuit adds up to the voltage of the cell or battery.
A battery can be made of several electrical cells added together.
The voltage of a battery made of electrical cells added in series is equal to the voltages of the cells added together.