For an ideal battery (r=0?), closing the switch in the figure (Figure 1) does no

ID: 1363798 • Letter: F

Question

For an ideal battery (r=0?), closing the switch in the figure (Figure 1) does not affect the brightness of bulb A. In practice, bulb A dims just a little when the switch closes. To see why, assume that the 2.0 V battery has an internal resistance 0.2 ? and that the resistance of a glowing bulb is 8.0 ? .

Part A

What is the current through bulb A when the switch is open?

Part B

What is the current through bulb A after the switch has closed?

Part C

By what percent does the current through A change when the switch is closed?

Explanation / Answer

For an ideal battery (r=0?), closing the switch in the figure (Figure 1) does no

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For an ideal battery (r=0?), closing the switch in the figure (Figure 1) does no

For an ideal gas, each of the following unquestionably leads to an increase in t

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For an ideal battery (r=0?), closing the switch in the figure (Figure 1) does no

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