In Tech we learnt about the same thing but we went to a different level because we used a voltmeter! . It was hard because we had so many wires and we didn't know where to plug it in. Then Ben, Joseph and Tj got it even with the voltmeter!. Me,Jane,Tali and Harry was confused until we got it in the end . Then we learnt about the light bulbs which are LED, Incandescent and CFL.
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