The Mall School is at Twickenham, Greater London.

9 hours ago

Year 4 have been making fruit batteries as part of their work on electricity. The challenge is to produce the highest voltage – and then increase the voltage by using more than one item of fruit in the circuit. Lemons are used traditionally but oranges work just as well, as do limes and apples, and, of course, potatoes. Voltmeters are very useful kit here for comparing the voltages generated. You can try other fruits and juicy vegetables too. More than half a volt should be enough to work a buzzer.

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