Title: Circuit Fundamentals and Circuit Measurement
Course: WGF 107 DEVELOPMENT > Section: Content

Image | Two digital voltmeters. Note the 40 microvolt difference between the two measurements, an offset of 34 parts per million.
Content | Instruments for measuring voltages include the voltmeter, the potentiometer, and the oscilloscope. The voltmeter works by measuring the current through a fixed resistor, which, according to Ohm's Law, is proportional to the voltage across the resistor. The potentiometer works by balancing the unknown voltage against a known voltage in a bridge circuit. The cathode-ray oscilloscope works by amplifying the voltage and using it to deflect an electron beam from a straight path, so that the deflection of the beam is proportional to the voltage.
Attributions | Image and Content courtesy of Wikipedia – The Free Internet Encyclopedia