Question

The electrical voltage between the ends of a resistor is equal to 8 V. A student has two voltmeters available that measure up to 6 V. The voltages of the voltmeters are equal to 500 ohms and 600 ohms, respectively. What voltages will the connected voltmeters indicate? (Fig. 3.45)​

Answer 1

I = V / R

I1 = 6 / 500 = .012 amps for full scale deflection

I2 = 6 / 600 = .01 amps for full scale deflection

I = 8 / 1100 = .00727 amps thru load (actual current)

D1 = .00727 / .012 = .606 of full scale deflection

D2 = .00727 / .01 = .727 of full scale deflection

V1 = .606 * 6 = 3.64 V (of 6 V)

V2 = .727 * 6 = 4.36 V (of 6 V)

Check: V1 + V2 = 3.64 + 4.36 = 8 V