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Wednesday 31st August 2016
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How do rechargable toothbrushes charge?


I have a rechargeable toothbrush and when you put it in the charging station, how does it charge? Thereís no direct connection.
Mike, Farnborough


** Definitive **
Name: James OíBrien
Qualification: Brushed teeth for 40 years
Answer: Itís an electro-magnetic field. You donít need a connection as the coil in the toothbrush goes around the basestation and it charges

** Confirmation **
Name: Anwar, A4
Qualification:  Engineer
Answer: Iím afraid James is right. It is electromagnetic induction. You;ve got a coil in the toothbrush and a magnet in the base. The coil goes around the magnet and charges the battery.