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Radiators create . . .

Cavity walls reduce this type of energy transfer.

useful power output/total power input=

Two of the main fossil fuels are coal and gas. Name the other.

This energy source is powered by falling water.

These are used to harness the power of the tides, using the Sun and Moon's gravity.

Which gas causes acid rain?

current x time=

The flow of electrical charge.

The driving force that pushes the charge around.