Question

How do I use a multimeter to measure Watts?

Answer 1

Answer:

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Explanation:

First, you need to measure voltage (in parallel to the powered device).

Then, you need to measure the current (Amps) the device draws at that voltage (in series with the device). Note that if the device is expected to draw high current, you must be careful—your multimeter has a limit of the current you can run through the Ampere meter and if you exceed that, you’ll blow the fuse of your multimeter. You should be fine with electronic devices, though.

Finally, you just calculate the power (in Watts) from the above. With DC, it’s simple—it’s just the product. With AC, it’s a little bit more complicated, but online services like e.g. Watts to Amps and Amps to Watts Calculator will do it for you. For a rough estimate (single phase), the product will do as well.