- 1). Turn on the digital multimeter. Turn the dial to the resistance measurement setting designated by the capital Greek letter omega.
- 2). Place the red probe of the multimeter on the side of the device wired to the positive terminal of the battery. The black multimeter probe connects to the side of the device wired to the negative terminal of the battery. Write down the resistance reading that appears on the screen. For example, let's say the resistance is 6.0 ohms.
- 3). Disconnect the multimeter. Turn the dial on the multimeter to measure DC current denoted by a capital "A" with straight lines above it. The "A" stands for amps, the unit of electrical current.
- 4). Disconnect the positive side of the resistor from the battery and connect the black probe of the multimeter to the positive side of the resistor. Connect the red probe of the multimeter to the negative terminal of the battery to complete the circuit. Record the current flowing through the resistor in amps. For example, let's say the current is 0.5 amps.
- 5). Multiply the current times the resistance to obtain the voltage across the restive device in volts. Completing the sample problem, you have 0.5 amps times 6.0 ohms, which equals 3.0 volts.
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