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You can find the current by using an ammeter. The cheapest way (although more invasive) is to use a probe type ammeter or multimeter. To use, you need to insert the meter in the current path of the resistor (in series with the resistor). These meters are fairly cheap - as low as $8 if you shop around. If it is not feasible to break the circuit and insert the meter, and you have room around a wire going to the resistor, you could use a clamp on ammeter as well. These are typically more expensive.

If you understand resistor codes, you can also use a volt meter/multimeter to measure the voltage drop across the resistor (put the probe in parallel with the resistor). The current should be equivalent to I = V / R.

If you don't know resistor codes, do an online search to match colors with numbers. There should be three stripes. The first two are the resistance and the third is a magnitude. For example, if the first color matches the number 1, and the second matches 8, and the third matches 3, then this is a 18 x 1000 = 1.8k ohm resistor.

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15y ago

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