Electrical Terms Two
Terms
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- Frequency
- The number of complete cycles per second existing in any form of wave motion.
- Thermistor
- A resistor that is used to compensate for temperature variations in a circuit.
- Potential
- The amount of charge held by a body as compared to another body. Measured in volts.
- Specific Gravity
- The ratio between the density of a substance and that of pure water at a given temperature.
- Full-wave rectifier
- A circuit which uses both the positive and negative alternations of an AC current to produce a Direct Current
- Overload
- A load greater than the rated load of an electrical device.
- Circular Mil
- Used for measuring the cross section of wires
- Gain
- The ratio of output voltage, power, or current to input voltage power or current.
- Counter EMF
- Counter Electromotive Force; an emf induced in a coil or armature the opposes the applied voltage.
- Phase Difference
- The time in electrical degrees by which one wave leads or lags another
- Henry
- Basic unit of inductance
- Positive Charge
- Deficient in electrons
- Micro
- One\Million
- Solenoid
- An electromagnetic coil with a moveable plunger.
- Conductance
- The ability of a material to conduct electricity. It is the reciprocal of the resistance of the material and is expressed in mhos.
- ThermoCouple
- A junction of two dissimilar metals that produces a voltage when heated.
- Potentiometer
- A variable voltage divider
- Vars
- Abbreviation for volt-amp, reactive
- Diode
- Allows current to flow in only one direction.
- Eddy Current
- Induced circulating currents in a conducting material that are caused by a varying magnetic field.
- Milli
- 1\1,000
- Impedance
- The total opposition to the flow of an alternating current. It may consist of any combination of resistance, inductive reactance, and capacitive reactance.
- Negative Charge
- The electrical charge carried by a body which has extra electrons
- Coaxial Cable
- A transmission line consisting of two conductors concentric with and insulated from each other
- Joule
- Unit of work equal to one amp flowing for one second through a resistance of one ohm.
- Permeability
- The ease through which magnetic lines of force may flow.
- Megger
- Used to measure high resistances
- Load
- The power being delivererd by any producing device.
- Induction
- The act of producing voltage by the realitive motion of a magnetic field across a conductor.
- Attentuator
- A network of resistors used to reduce voltage, current, or power delivered to a load
- Flux Field
- All electric or magnetic lines of force in a given region.
- Polyphase
- A circuit that uses more than one phase of alternating current
- Galvanometer
- An instrument used to measure small d-c currents
- Lead
- The opposite of lag
- megohm
- One million Ohms
- Relay
- An electromechanical switching device.
- Choke Coil
- A coil of low ohmic resistance and high impedance to alternating current
- Hertz
- A unit of frequency equal to one cycle per second
- Syncroscope
- An instrument used to indicate a difference of frequency between two a-c sources.
- Reactance
- The opposition offered to the flow of an alternating current by the inductance, capacitance, or both in any circuit.
- Inductive Reactance
- The opposition to the flow of alternating or pulsating current caused by the inductance of a circuit. It is measured in ohms.
- Hysteresis
- A lagging of the magnetic flux in a magnetic material behind the magnetizing force which is producing it.
- Inphase
- Applied when two waves pass through their max and min peaks at the same time. The amplitudes do not need to be equal.
- Farad
- The unit of capacitance
- Rheostat
- A variable resistor
- Servo
- A device used to convert a small movement into a greater movement or force.
- Cycle
- One complete positive and one complete negative alternation of a current or voltage.
- Field
- The space containing electric or magnetic lines of force.
- Dielectric
- An insulator; a term that refers to the insulating material between the plates of a capacitor.