21. Draw the circuit diagrams indicating the correct placement for the voltmeter in the following situations.

(Use a circle with a “V” in it to represent the voltmeter.)

(a) Three resistors are wired in parallel and you want to measure the voltage across all of them with just one measurement.

(b) Three resistors are wired in parallel and you want to measure the voltage across just one of them.

(c) Three resistors are wired in series and you want to measure the total voltage across them.

(d) Three resistors are wired in series and you want to measure the voltage across just one of them.