A galvanometer has Rg = 95 ohms and 10 x 10^-5 A/division. The galvanometer has

Question

A galvanometer has Rg = 95 ohms and 10 x 10^-5 A/division. The galvanometer has five divisions for a full-scale reading (i.e., N = 5). What value of resistance is needed for the galvanometer to form a full-scale voltmeter if VF5 = 12 volts? Please round answer to the nearest whole number. A galvanometer has Rg = 95 ohms and 10 x 10^-5 A/division. The galvanometer has five divisions for a full-scale reading (i.e., N = 5). What value of resistance is needed for the galvanometer to form a full-scale voltmeter if VF5 = 12 volts? Please round answer to the nearest whole number.

Explanation / Answer

total current in the galvanometer ,Im = 10 *10^-5 * 5

Im = 50 * 10^-5

let the resistance needed is R

(95 + R) * 50 *10^-5 = 12

solving for R

R = 23905 Ohm

the resistance needed is 23905 Ohm

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