A series circuit consists of three identical lamps connected to a battery as shown in the figure. The switch S, originally open, is closed. What happens to the brightness of lamp C?
(a)It increases.
(b) It decreases somewhat.
(c) It doesn't change.
(d) It drops to zero.
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A circuit consists of three identical lamps, each of resistance , connected to a battery as shown in the figure.
(a) Calculate an expression for the equivalent resistance of the circuit when the switch is open. Repeat the calculation when the switch is closed.
(b) Write an expression for the power supplied by the battery when the switch is open. Repeat the calculation when the switch is closed.
(c) Using the results already obtained, explain what happens to the brightness of the lamps when the switch is closed.
Three identical light bulbs, A, B, and C, are connected in the circuit as shown in figure.
When the switch S is closed,
A. the brightness of A and B remains the same as it was, but C goes out.
B. the brightness of A and remains the same as it was, but C will be about half as bright as it was.
C.The brightness of A and B decreases and C goes out.
D. the brightness of A and B increases and C will be about half as bright as it was.
E. The brightness of A and B increases but C goes out.
