« Back to Category: Measurements Random (Advanced) Next in Category »
A voltmeter having a range of 150 volts and an internal resistance of 150 000 ohms is to be extended to read 750 volts. The required multiplier resistor would have a value of:
600 000 ohms
Original sensitivity: Full-scale current Ifs = V_orig / R_orig = 150V / 150kΩ = 1mA. For new range V_new=750V, total resistance R_total = V_new / Ifs = 750V / 1mA = 750kΩ. Multiplier R_mult = R_total - R_orig = 750kΩ - 150kΩ = 600kΩ.
Warning: Generated by AI