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galvanometer
a device measuring electric current, using needle displacement.
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electroscope
most common device for demonstrating electrostatic forces, consisting of two foil leaves attached to a conducting rod and placed in a sealed container so that air cannot move the foil leaves, which stand apart from each other when a charged object is brought near.
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thermocouple principle
if a current is flowing through 2 different metals with different properties, of the right combination, heat is generated, as well as another current. This can be used to make a galvanometer.
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D'Arsonval movement
a DC moving coil-type movement in which an electromagnetic core is suspended between two poles of a permanent magnet, or sometimes a more rugged electromagnet.
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full-scale deflection
a meter being pushed to full capacity, as little as 50 ua can cause this.
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internal resistance
The opposition exhibited by a circuit element to the flow of direct current (dc)
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shunt resistance
a device which allows electric current to pass around another point in the circuit
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voltmeter
instrument for measuring voltage between two points, with a high resistance.
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electrostatic voltmeter
a voltemeter that uses the mutual repulsion between two charged plates to deflect a pointer attached to a spring, and can detect and indicate ac and dc voltages.
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ohmmeter
a a milliameter or microammeter in a series with a set of fixed, switchable resistances, and a battery that provides a known, constant voltage.
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VOM
volt-ohm-milliammeter, combined multimeter
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FET
field-effect transistor. a type of transistor commonly used for weak-signal amplification (for example, for amplifying wireless signals).
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wattmeter
is an instrument for measuring the electric power in watts of any given circuit, by measuring the current, multiplied by the voltage.
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watt-hour meters
an electromechanical induction meter operates by counting the revolutions of an aluminium disc which is made to rotate at a speed proportional to the power.
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oscilloscope
a type of electronic test instrumentthat allows observation of constantly varying signal voltages, usually as a two-dimensional graph of one or more electrical potential differences using the vertical or 'Y' axis, plotted as a function of time, (horizontal or 'x' axis). can measure frequency, a wave form's shape, or peak signal voltage.
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bar-graph meter
a meter made using a string of LEDs.
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utility meter
used to measure the number of watts being used at the time
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