Consider the figure to the right. The battery with an emf of 3.0 V and an intern

Question

Consider the figure to the right. The battery with an emf of 3.0 V and an internal resistance r=0.4 W is connected to the R=100 W resistor.  Answer the following questions. Show solutions to receive full credit.       

When switch S is open, what is the reading on the voltmeter?

Consider the figure to the right. The battery with an emf of 3.0 V and an internal resistance r=0.4 W is connected to the R=100 W resistor. Answer the following questions. Show solutions to receive full credit. When switch S is open, what is the reading on the voltmeter? When switch S is closed, what is the reading on the voltmeter?

Explanation / Answer

when switch is opened, i = 0

so, v = e = 3 volts



when switch is opened,

i = e/(r+R) = 3/(0.4+100) = 0.02988 A

v = e - i*r = 3 - 0.02988*0.4 = 2.988 volts

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