Concept:A potentiometer measures voltage without drawing current from the circuit.Explanation:A voltmeter always draws a small current from the circuit to operate.This can change the voltage being measured.A potentiometer works by balancing the unknown voltage against a known potential difference.At the balance point, no current is taken from the circuit being measured.Therefore, it gives a more accurate reading because it consumes negligible current.Answer:B. consumes negligible current