ELTE 114 1st test
Terms
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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. - 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