A customer recently called to ask questions about the electrical system on his machine. I asked if he had a voltmeter. There was a long pause, then he said, “Yes, but I don’t know how to use it.” He ...

Not so long ago, the simple 12-volt test light was the tool to use when tracking down electrical problems. Increasingly, though, the digital multimeter is used by electricians and do-it-yourselfers to ...

Back in the early days of electricity, lab workers could measure electric current in a circuit using an ammeter (galvanometer) and voltage using a voltmeter. From there, they could calculate ...