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The wires connecting the switches, light-bulbs and buzzers must start and end at the power source before the circuit can work. The power source could be a A) battery.

B) light-bulb.
C) switch.
D) wire.

User Ggagliano
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1 Answer

2 votes
A) Battery. (I suck at explaining things by the way so sorry I only said A please just trust me)

User Egergo
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