If a zero-centered voltmeter has a scale from 5V to − 5V, then the span of it is

• A. 0 V
• B. −5 V
• C. 10V
• D. 5 V

Answer: (C)

Voltage Scale Span of  instrument = Vmax − Vmin
Given
Vmax = 5 V
Vmin = −5V
Span = 5 −(−5) = 10 V