Electricity is the flow of subatomic charged particles, called electrons, through wires. As the electrons flow through the wire, they scatter off one another, and also off the surfaces of the wire. This leads to the electrons losing energy and speed. This phenomena is known as electrical resistance. Resistors are electrical components that deliberately place an electrical resistance within a circuit. When devices fail, a measurement of electrical component resistance can help in fault testing. Today, this is normally carried out with a digital multimeter which has superseded older Ohm meters from the 1970s and 1980s.
Things You'll Need
- Digital Ohm/multimeter
Plug the probes into the digital Ohm/multimeter meter. Plug the red lead into the positive terminal and the black lead into the negative terminal.
Switch on the digital Ohm meter/multimeter. If a multimeter is being used, switch it to the resistance function. Select the correct range of resistance or switch the digital Ohm meter/multimeter to auto-range. Bring the positive and negative terminals into contact with one another. The digital ohm meter/multimeter should measure a very small resistance of less than 0.5 Ohms.
Ensure that the device being tested is switched off. Place a probe on either side of the component that needs to be tested. The digital ohm meter/multimeter will display the resistance in units of Ohm.
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