To which points could you hook your voltmeter to read the voltage across : R 1 ?

Question

To which points could you hook your voltmeter to read the voltage across :

R1 ?= B and D

R2 ?= D and I

R3 ?= D and I

Power Supply = A and B

Choose the correct and true statement. Only one is correct and one try.

a) To make the above measurement, you MUST disconnect part of the circuit in order to attach the voltmeter probes correctly.

b) To make the above measurement, you MUST NOT disconnect any of the circuit. You simply connect the probes of the voltmeter to the desired terminals.

c) It doesn't matter whether you disconnect any point in the circuit. You'll still get a sensible reading of the voltage across the desired element.

Explanation / Answer

Solution:

Let us go to the basics first.

For voltmeter to read the voltage across :

R1 = (B and D) or (C and D) [since resistor R1 is between B or C and D; see given circuit] (Answer)

R2 = (E and G) [since resistor R2 is between E and G; see given circuit] (Answer)

R3 = (F and H) [since resistor R3 is between F and H; see given circuit] (Answer)

Power Supply = (A and B) [since Power supply is between A and B; see given circuit] (Answer)

Choose the correct and true statement:

b) To make the above measurement, you MUST NOT disconnect any of the circuit. You simply connect the probes of the voltmeter to the desired terminals. (TRUE / CORRECT). (Answer)

Thanks!!!

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