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voltmeter

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Voltmeter


Instrument for measuring the potential difference (voltage) between two points in a circuit. It should not be confused with an ammeter, which measures current. A voltmeter has a high internal resistance (so that it passes only a small current), and is connected in parallel with the component across which potential difference is to be measured – that is, the current divides and passes through both the voltmeter and the component at the same time.

A common type of voltmeter is constructed from a sensitive current-detecting moving-coil galvanometer placed in series with a high-value resistor (multiplier). To measure an AC (alternating current) voltage, the circuit must usually include a rectifier; however, a moving-iron instrument can be used to measure alternating voltages without the need for such a device.

© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.


 
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alternating current
ammeter
amp
ampere
amplifier
battery
capacitor
cell, electrical
circuit (physics)
circuit breaker
conductor (chemistry)
conventional current
coulomb
diode
direct current
electric bell
electric charge
electric current
electric motor
electric power
electricity
electromotive force
electron flow
electronics
energy transfer
farad
generator
insulator
integrated circuit
lamp, electric
LCD
light bulb
light-dependent resistor
light-emitting diode
liquid-crystal display
logic gate
ohm
Ohm's law
operational amplifier
parallel circuit
potential difference
printed circuit board
rectifier
relay
resistance
resistor
semiconductor
series circuit
static electricity
switch
thermistor
thyristor
timer circuit
transistor
volt
voltage
voltmeter
watt

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