A circuit consists of three identical lamps,each of
Chapter , Problem 51(choose chapter or problem)
A circuit consists of three identical lamps,each of resistance R, connected to a battery as in FigureP18.51. (a) Calculate an expression for the equivalentresistance 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 thebattery when the switch is open. Repeat the calculationwhen the switch is closed. (c) Using the results alreadyobtained, explain what happens to the brightness ofthe lamps when the switch is closed.
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