How to Check an AC Resistor
- 1). Plug the red lead of the digital multimeter into its positive port. Plug the black lead of the digital multimeter into its negative, or sometimes labelled "common," port.
- 2). Turn on the digital multimeter. Grasp the measurement dial and rotate it to the resistance setting. Usually the resistance setting is denoted by the capital Greek letter omega, which stands for ohms.
- 3). Connect the red and black leads of the multimeter to opposite ends of the resistor. If the leads have alligator clips on their ends, use them; otherwise, simply touch the leads to the ends of the resistor. The resistance in ohms is displayed on the multimeter screen. If this measured value is not within five percent of the manufactured value written on the AC resistor, replace the resistor.
