[填空题]
Three resistors with
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The switch is in the open position shown, and both the ammeter and voltmeter are ideal.
1.State what is meant by electromotive force.
2.Determine the reading of the voltmeter. V= $V$
3.The]3.The]4.With the switch remaining closed, the ammeter is replaced with a non-ideal meter.
Determine how this affects the reading of the voltmeter. Justify your answer.
