To extend range of ac voltmeter which will prefer?

To extend the range of an AC voltmeter, a high-value series resistor can be used. This configuration allows the voltmeter to measure higher voltages without exceeding its maximum input rating, as the resistor drops the excess voltage. Additionally, using a transformer can effectively step down the voltage to a measurable level, enabling more accurate readings at higher voltages. Always ensure the components are rated for the necessary voltage and power levels.