a) In general, the voltage across the circuit network will be different from the

Question

a) In general, the voltage across the circuit network will be different from the voltage set on the signal generator. why do you think this is?

b) we assume that the resistance of the Ammeter is "zero" such that is does not add resistance to the series part of the circuit. is this a good assumption? why or why not?

c) we assume that the resistance of the voltmeter is "infinite" such that is does not affect the circuit when it is connected in parallel with a device. is this a good assumption? why or why not?

Explanation / Answer

Part A) The voltage across the circuit network will be different from the voltage set on the signal generator because when current passes through some of the electrical energy is used by that component and rest is supplied to the next this is according to law of conservation of energy.

Part B) If we look at the construction of a Ammeter it has a shunt resistance in parallel due to which its effective resistance is very low so potential drop across ammeter is very less and we can assume that it will not overall add up to total circuit resistance. But this only true for a ideal device.

Part C) If we look at the construction of a voltmeter it has a large resistance in series due to which its effective resistance is very high when a voltmeter is connected in parallel effective resistance will not change much so potential drop across Voltmeter is same as across that circuit component . But this only true for a ideal device.

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