Electromagnetic Deflection
Early experimenters with electricity and magnetism noticed that an electric current produces a magnetic field. […]
Early experimenters with electricity and magnetism noticed that an electric current produces a magnetic field. […]
Electric fields produce forces, just as magnetic fields do. You have noticed this when your […]
Another phenomenon, sometimes useful in the measurement of electric currents, is the fact that whenever […]
A magnetic compass doesn’t make a very convenient meter. It has to be lying flat, […]
Current, as we have seen, consists of a flow of charge carriers. Voltage, or electromotive […]
If all other factors are held constant, the current through a circuit depends on the […]
In the electronics lab, a common piece of test equipment is the multimeter, in which […]
A good voltmeter disturbs the circuit under test as little as possible, and this requires […]
The measurement of electrical power requires that voltage and current both be measured simultaneously. Remember […]
Electrical energy, as you now know, is measured in watt-hours or kilowatt-hours (kWh). Not surprisingly, […]
Increasingly, metering devices are being designed so that they provide a direct readout. The number […]
The measurement of energy used by your home is an application to which digital metering […]
In high-fidelity equipment, especially the more sophisticated amplifiers (“amps”), loudness meters are sometimes used. These […]
The intensity of visible light is measured by means of a light meter or illumination […]
A meter movement can be equipped with a marking device to keep a graphic record […]
Another graphic metering device is the oscilloscope. This measures and records quantities that vary rapidly, […]