Recreational Vehicle (RV) Technician Practice Test

When measuring current with a voltmeter, it's essential to start at the highest scale. This practice safeguards the meter against potential overloads that may occur if it is subjected to a current greater than its lower settings can handle. By beginning with the highest range, the user can ensure that the device will not be damaged by unexpected high currents and can then gradually adjust to lower ranges as needed to obtain a more precise reading.

Starting on a lower scale could result in incorrect measurements or even damage to the voltmeter if the actual current exceeds that lower threshold. This strategy is particularly important with sensitive instruments that might be impacted by higher electrical loads. Thus, always starting the measurement process on the highest scale allows for a safe and accurate approach to current measurement.