Meters: A galvanometer coil having a resistance of 20 Ω and a full-scale deflection at 1.0 mA is connected in series with a 4980 Ω resistance to build a voltmeter. What is the maximum voltage that this voltmeter can read?
A) 3.0 V
B) 1.0 V
C) 50 V
D) 5.0 V
E) 10 V

Question

Quizplus · Accepted Answer

We can use the formula V=IR, where V is the maximum voltage, I is the full-scale deflection current (1.0 mA), and R is the total resistance in the circuit (20 Ω + 4980 Ω = 5000 Ω).

V = IR = (1.0 mA)(5000 Ω) = 5.0 V

Therefore, the maximum voltage that this voltmeter can read is 5.0 V, so the correct answer is D.

Meters: a Galvanometer Coil Having a Resistance of 20 Ω