B refers to Basic, A refers to Average, H refers to Hard, and * refers to problems with an...

B refers to Basic, A refers to Average, H refers to Hard, and * refers to problems with answers.

(A) A 5 V source (Vs) with a 5 Ω internal resistor (Rint,s) is providing power for a circuit whose equivalent resistance (Reqv) is 500 Ω (shown in Figure). Assume that you use a voltmeter with a 1 MΩ internal resistor (Rint,vm) to check the voltage on the circuit. When you begin to check the voltage, how will the voltage applied on the circuit change? How much will it change? If the voltmeter’s internal resistor is 500 Ω, how much would the change be?

FIGURE Using a voltmeter to check circuit voltage.