Electrical Projects Along with voltage, current and resistance readings, one of the best indications of an appliance's performance is its wattage. A check of the appliance with an ac wattmeter will let you know whether or not it is dissipating too much power without the need of going through more extensive troubleshooting steps or replacing expensive parts.

Many wattmeters also have the capability of measuring line voltage with more accuracy than a VOM, as well as measuring alternating and direct current. A standard three-prong receptacle on the face of the meter allows the operator to make through-the-plug tests without handling test leads.

October 6, 2008