Voltmeter

A voltmeter is an electronic test instrument which measures the electrical potential difference or voltage across the input terminals. A voltmeter must be connected in parallel with the circuit being tested, unlike an ammeter which is connected in series. Voltmeters...

Basic Electrical Concepts

Basic Electrical Terms and Units Current Resistance Voltage Power Comsumed in a Resistor Measuring Instruments Ammeter Ohmmeter Voltmeter Related Topics Terms and Units SI Prefixes Electrical Electrical and Electronic Weblinks

Ammeter

An ammeter is a device which measures the flow of electrical current. The current may be either continuous (DC) or alternating (AC) and is measured in amperes (A), microamps (mA) or milliamps (µA). Unlike a voltmeter, an ammeter is normally inserted in series...
Magnetic Compass

Magnetic Compass

A magnetic compass is a navigational device which uses a pivoted permanent magnet to point towards Magnetic North. A much smaller plotting compass is sometimes used to plot the direction of lines of magnetic flux around a magnet. Strange but True: The North-pointing...