The Challenge: Recharge a Battery
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What voltage are
Car batteries are
made up of six 'cells' each giving a voltage
of 2.2 volts (2.2v) when fully charged and about 1.8v when discharged. When
a car battery is fully charged it has a voltage of 13.2v.
So to fully charge a car battery we somehow have to produce a voltage
of at least 13.2v (we'll aim at 14v) and force this back into the battery.
How can we recharge a battery without wall current?