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In a house there are four lights in parallel. Draw three switches on the circuit so that: |
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| a) |
One switch can turn off all the lamps, (label this switch A). |
| b) |
Another switch can leave two of the lamps on, and two of the lamps off, (label this switch B). |
| c) |
Opening one switch will allow three lamps to be left on, (label this switch C). |
