Analyze the circuit diagram given below and state which switch or switches must be closed to make the lamps light up? Justify your answer.
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Answer:
When only switch A is closed, the circuit is open at 'B', hence the entire circuit would be open.
Zero bulbs would glow.
If only B is closed, only the first part of the three parallel bulb circuits would be open.
Hence 3 bulbs would glow (the one in series, and the two that are part of the closed circuit).
Explanation:
When only switch A is closed, the circuit is open at 'B', hence the entire circuit would be open.
Zero bulbs would glow.
If only B is closed, only the first part of the three parallel bulb circuits would be open.
Hence 3 bulbs would glow (the one in series, and the two that are part of the closed circuit).
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