16· 0/0 points 1 Previous Answers My Notes Ask Your Teacher A series circuit con

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16· 0/0 points 1 Previous Answers My Notes Ask Your Teacher A series circuit consists of three identical lamps connected to a battery as shown in the figure below.The switch S, originally open, is closed (i) What then happens to the brightness of lamp B? It increases It increases. (ii) What happens to the brightness of lamp C? It drops to zero. (iii) What happens to the current in the battery? It increases. (iv) What happens to the potential difference across lamp A? It increases. (v) What happens to the potential difference across lamp C? It drops to zero. (vi) What happens to the total power delivered to the lamps by the battery? It increases Need Help?Read It

Explanation / Answer

Explanation:

When the switch is closed then the path containing switch acts ideally as zero resistance path and thus no current flows through bulb "C" and thus overall resistance offered by the circuit decreases which leads to increase in current in the circuit.

i) Now as current in the circuit increases , so more current flows through the bulb "B" which leads to increase in its brightness.

ii) it drops to zero as no current flows through "C" .

iii) Current in battery increases as net resistance offered by the circuit decreases.

iv) More current in circuit means more current through "A" and as "A's" resistance is fixed so more current means more potential difference across it .( Ohm's law) .

v) It drops to zero as both its end are connected by a zero resistance path or we can say both its ends brought to same potential.

vi) The resistance of the circuit decreased this lead to increase in power delivered to the circuit.

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