There’s hardly any piece of test equipment more fundamental than a volt ohm meter. Today you’re likely to have a digital one, but for most of history, these devices had real needle meters. The ...

When you need a multimeter for testing electrical equipment around the home, it's vital to know what all those symbols around ...

With this guide, you'll learn the ins and outs of troubleshooting your home and household electronics using a handy multimeter.

There’s hardly any piece of test equipment more fundamental than a volt ohm meter. Today you’re likely to have a digital one, but for most of history, these devices had real needle meters. The ...

It's a must-have for any toolbox—but there's a learning curve involved. Learn how to use a multimeter for all of your electrical testing needs.

Be cautious when using an analog volt-ohm meter to test diode or transistor junction. These meters can drive currents up to 50 mA through the junction, potentially damaging the unit under test.

Diagnose electrical problems by chasing voltage drops, instead of the old-fashioned way -- checking continuity. Including Mike Allen's Physics 101 introduction to Ohm's law.

A multimeter or digital multimeter (DMM) is one of the most essential and common pieces of lab equipment. Multimeters are used for taking basic electrical measurements related to Ohm’s Law.

Impedance is measured at frequency. Your volt-ohm meter is simply measuring DC resistance and not impedance. Also, if this is a 4 Ohm woofer, that would be it's impedance in free-air.