A multimeter is the most efficient tool for testing electrical current and motors. A multimeter is a device that measures electrical properties, such as voltage, current, and resistance. It can also be used to test continuity, which is the ability of a circuit to complete a path for current flow.

When testing electrical current and motors, a multimeter can be used to measure the following:

- Voltage: The voltage of an electrical circuit is the difference in electrical potential between two points in the circuit. It is measured in volts (V).

- Current: The current of an electrical circuit is the amount of electrical charge flowing through a circuit in a given amount of time. It is measured in amperes (A).

- Resistance: The resistance of an electrical circuit is the opposition to the flow of current in a circuit. It is measured in ohms (Ω).

- Continuity: Continuity is the ability of a circuit to complete a path for current flow. A multimeter can be used to test continuity by checking whether there is an audible tone or a reading of zero ohms when the probes of the multimeter are connected to two points in the circuit.

A multimeter is a valuable tool for any electrician or do-it-yourselfer who works with electrical circuits and motors. It is a versatile device that can be used to perform a variety of tests, and it can help to diagnose problems and ensure that electrical systems are safe and functional.