- #1

- 3

- 0

a: zero

b: the terminal voltage of the battery

c: the voltage drop across the internal resistance of the battery

d: the voltage drop across the resistor

Is it C?

- Thread starter asdasdasd
- Start date

- #1

- 3

- 0

a: zero

b: the terminal voltage of the battery

c: the voltage drop across the internal resistance of the battery

d: the voltage drop across the resistor

Is it C?

- #2

- 360

- 21

I think B.

- #3

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1) If "in series" means that the whole circuit is just the battery, the resistor and the voltmeter (one after the other and closed in a loop) and that you have the voltmeter "closing the circuit", then the answer is B, because the voltmeter blocks any current along it (at least if you consider it a "perfect" voltmeter) and therefore there is no voltage drop around the resistor.

2) If "in series means that there is a whole circuit around, and you "open" the circuit at some point after the voltmeter and the resistor and insert the voltmeter, the answer is A because the voltmeter would be measuring the voltage drop around itself.

- #4

- 360

- 21

It seems to me that all of the voltage is dropped in either case so you are measuring terminal voltage. Unless I misunderstand...2) If "in series means that there is a whole circuit around, and you "open" the circuit at some point after the voltmeter and the resistor and insert the voltmeter, the answer is A because the voltmeter would be measuring the voltage drop around itself.

- #5

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Actually we probably don't know, there may be other batteries along the circuit. However I don't think that the question was about case 2), it makes much more sense if it meant that the only components in the circuit are the mentioned battery, the resistor and the voltmeter.It seems to me that all of the voltage is dropped in either case so you are measuring terminal voltage. Unless I misunderstand...

- #6

stewartcs

Science Advisor

- 2,177

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Draw the circuit, first without the resistor. Remove a section of the wire where the voltmeter would be placed. You should have an open circuit with a battery and two pieces of wire. Now what would the voltmeter read if it were placed in series (i.e. you put one probe on the first wire and the other probe on the second wire)?

a: zero

b: the terminal voltage of the battery

c: the voltage drop across the internal resistance of the battery

d: the voltage drop across the resistor

Is it C?

Next draw the circuit with the resistor at the end of the first wire, place the voltmeter in the series again (i.e. one probe on the end of the resistor and the other probe on the remaining wire) and ask yourself the same question.

Hope that helps.

CS

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