After exploring circuits, switches and electrical circuit diagrams, the children were tasked with designing, creating and testing their own forms of secret communication during the Blitz. The machines would have to use Morse code, travel a distance of 25 metres and must not be able to be seen by low-flying enemy planes!
They designed and evaluated how battery and bulb affected their machines before sending coded messages to other groups.
Unfortunately not the ones with chocolate chips.
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