Question

A voltmeter has a range 0-V with a series resistance R. With a series resistance 2 R, the range is 0-V'. The correct relation between V and V' is

• A. V' < 2V
• B. V' > > 2V
• C. V'=2V
• D. V' > 2V

Answer 1

Answer: (A)

V' < 2V

Answer 2

Using V = $I_g$ (G + R) we get V' = $I_g$ (G + 2R) and 2V = $I_g$ (2G + 2R) $\therefore$ V' < 2V