Measuring the amperage, or number of amps, in an electrical circuit requires a tool called a multi-meter. They are somewhat difficult to use, but fortunately for you this video explains in great detail how multi-meters work and what you need to do to ensure that they work. The creator tests the amperage of a power drill batter as an example.
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Plumbing & Electric How to Measure the amps of an electrical circuit with a multi-meter

By WonderHowTo
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