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But this is only a first step: the set-up would not be practical for calibrating current-measuring ammeters, which need to run at higher currents.

From little laser things that allow you to size up a room quickly through to gizmos to measure atmospheric pressure, humidity, gas levels in the atmosphere, ammeters and voltmeters.

Accordingly, the inductance and capacity of the lateral branch of the transmitter is altered until the hot wire ammeter in the base of the aerial shows the largest possible current.

The voltmeter is therefore the same as the ammeter, except that its dial is marked for volts instead of for amperes, and it has to be provided with the resistance coil.

Other Tools and Equipment As you go along in electrical work, you'll be adding tools and other equipment, such as a trouble light and maybe an ammeter or voltmeter.