The northern lights are caused by

Electric current flows through a circuit only when it is

Electric current is the

Plasitc and rubber are used to coat electrical wires because they are good

If you hold the north poles of magnets together, they will

Most electric generators make electricity using

If you plug in too many appliances into one circuit, the wires can

When two objects have different electric charges, they

Electric current is the flow of

A magnet's force is at its poles

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