ELTE 114 1st test
Terms
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 VOM
 VoltOhmMilliammeter
 DMM

digital multimeterA peice of test equipment used for
measuring voltage, current, resistance, and possibly other
electircal quantities and displaying the value in number form.  Loading
 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