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Glossary of ELTE 114 1st test

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VOM
Volt-Ohm-Milliammeter
DMM
digital multimeter-A peice of test equipment used for
measuring voltage, current, resistance, and possibly other
electircal quantities and displaying the value in number form.
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To raise the power demand in (an electrical circuit), as by adding resistance.
Short Circuits
occurs when the current finds a way to bypass the appliance on a path that has little or no resistance
Open Circuits
Any circuit which is not complete is considered an open circuit
Voltmeter
an instrument (as a galvanometer) for measuring in volts the differences of potential between different points of an electrical circuit
Ohmmeter
a meter for measuring electrical resistance in ohms
Meter Shunts
a percision resistor connected in parallel across the meter movement to bypass a specific amount of currentaround the meter movement.
Wheatstone Brige formulas
Rx R1
-- = --
Rs R2
Current Divider
(It)(R2)
IR1 = --------
R1 + R2
Votage Divider rule
Vout = Vin*R2/(R1+R2)
Kirchoffs law
The total current flowing towards a junction is equal to the total current flowing away from that junction.
Im =
Full scale deflection
rm =
Internal resistance of meter
Vm =
Voltage across meter
Is =
Shunt Current
Rs =
Shunt Resistance
It =
Total Resistance
Formula

Vm=
Im*rm
Formula

Rs
Vm
--
Is

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