Question

What is 20m on A multimeter?

Answer 1

On a multimeter, "20m" typically refers to a measurement range for milliamps (mA), which is one-thousandth of an ampere (A).

So, when you see "20m" on the dial of a multimeter, it means the multimeter is set to measure electrical current in the range of up to 20 milliamps. If you're measuring a current higher than that, you'll need to switch to a higher range to avoid damaging the multimeter.

For example:

1. If you're measuring a small current in a circuit, setting the multimeter to "20m" allows you to measure currents up to 20mA.
   

1. If the current in the circuit is higher than 20mA, the multimeter will either show an overload (or be out of range), and you’ll need to switch to a higher current setting like 200mA, 2A, etc.
   

It's important to use the correct range for the current you're expecting to measure to avoid damaging the multimeter or getting inaccurate readings.