Electronics digital multimeter

You can’t really sense electricity other than the output of some components that light up, spin, get hot, or feeling pain from a shock, etc. Therefore you should take multimeter measurements of circuits you are learning about.

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  • Voltage is measured across 2 points such as battery terminals or across one or more components. Virtually no current passes through the meter while measuring measuring voltage so it will not noticeably affect most circuits. It is safe to measure voltages as long as the meter’s voltage setting is above the voltage being measured and nothing else touches the probes.
  • Current is measured by opening the circuit and completing the circuit through the meter. The meter does not limit current, so current must be limited by other components. Never measure power source current directly, always make sure current is limited.
  • Resistance is measured by putting the probes across the component or circuit area wanting to be measured. The meter provides the power needed to take the measurement and there should be no power being supplied to the area being measured. There should be no other conductive paths for the current from the meter to flow to as that will result in a different resistance reading.

Video below: How to measure electronics current with digital multimeters after voltage and resistance review Click here to watch directly on YouTube!

Electronics current calculations and multimeter measurement basics diagram by electronzap electronzapdotcom
Electronics current calculations and multimeter measurement basics diagram by electronzap electronzapdotcom

Multimeter oscilloscope measurement of 555 timer inductor voltage booster circuit video below. Click here to watch directly on YouTube!

How to measure LED forward voltage using multimeter diode tester setting probably at 1mA current video below. Click here to watch directly on YouTube.


It is important to read the manual of any multimeter you use, but I think this page (when it has been filled out more) will help you learn about multimeters.



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