PHYSICS · Single correct · A Level · Physics · Electricity · Electricity
Problem
During an investigation of a series circuit, a 0.80 V drop is unexpectedly measured across a short length of connecting wire that ideally should have negligible resistance. Which of the following is most consistent with this observation?
(a) The internal resistance of the ammeter used in the circuit is significant.
(b) The battery’s internal resistance is producing the 0.80\,V drop along the leads.
(c) A loose connection at one end of the wire has increased its effective resistance.
(d) The voltmeter measuring the drop draws substantial current because of its low internal resistance.