Some people live in very remote parts of the world where there is no mains electricity. One island produces its own electricity using diesel generators. The lighthouse does not have access to mains electricity so it uses batteries. These are equivalent to 100,000 torch batteries. The batteries are recharged by diesel generators which produce electricity. The lighthouse works just like a large torch.

First broadcast:
9 October 2007

After viewing the clip, pupils could use a range of information sources to investigate ways of generating electricity. They children could go on to generate electricity themselves. They could try rubbing a woolly jumper with a balloon and sticking the balloon to the wall with static electricity, or looking for the tiny sparks generated by taking off the jumper in a darkened room. They could pedal on a stationary bike to power a dynamo and light the bike lamp, or use wind-up radios and torches. They could use a solar-powered device, such as a calculator. They could build a battery from a lemon, a zinc nail and a copper coin, to light a small bulb.