Recreational Vehicle (RV) Technician Practice Test

When measuring the amperage of a circuit using a meter, how must the meter be connected?

1. In parallel

2. In series

3. Across the voltage source

4. Any way is acceptable

The correct answer is: In series

When measuring the amperage of a circuit, the meter must be connected in series with the circuit. This is necessary because amperage, or current, represents the flow of electric charge through a circuit. When a meter is connected in series, it becomes part of the circuit, allowing the current flowing through the entire circuit to be measured accurately. If the meter were connected in parallel instead, it would create a shortcut for the current to flow through the meter instead of the intended load. This connection would not only provide an inaccurate current measurement but could also potentially damage the meter or the circuit itself due to excessive current passing through it. Connecting the meter across the voltage source would also be inappropriate for measuring current, as this configuration is used for measuring voltage, not current. Lastly, saying that any connection method is acceptable neglects the fundamental principle that ensuring accurate readings is contingent upon the specific manner in which the meter is connected to the circuit.