Electrical Terminology Flashcards
If a photon radiating into an electronic device causes the production of an electron/hole pair, the device is known as a.
photodiode.
Faraday’s Law States that.
the magnitude of the EMF is directly proportional to the rate of change of flux.
What is 1 Amp in mA?
1000 mA.
The term that describes the combined resistive forces in an AC circuit is.
impedance.
Ohm’s law states that:
current = e.m.f. divided by resistance.
E.M.F. in an electric circuit corresponds to what in a magnetic circuit.
MMF.
In conventional current flow, what is Fleming’s right hand rule used for?
Generators.
The SI unit of work is.
Kilogram metres-force.
Work is measured in joules, which is Newton.metres or kilogram.metres force (since Newtons are kilograms force).
A coulomb is.
one ampere * second.
Current (amps) = charge (coulombs) per second. You do the transposition.
An electric current is a flow of.
electrons from a negatively charged area to a positively charged area.
Electrons flow from negative to positive.
A volt can be considered to be a.
unit of electrical pressure.
‘Electrical pressure’ is sometimes used instead of voltage, due to its analogy to a head of pressure in fluids.
What is 3.25 volts in millivolts?
3,250 millivolts.
Electromotive force is measured in.
Volts.
EMF is another term for voltage, or potential difference (PD) or electrical pressure, all measured in Volts.
Kirchhoff’s law states.
the algebraic sum of all the currents entering or leaving a series of components will be equal to one.
The basis for transformer operation in the use of alternating current is mutual.
inductance.
When two coils are linked by a common flux, a voltage can be induced in one by a changing current in the other. This process is known as.
mutual induction.
When an electrical supply becomes ‘open-circuit’.
the loss of continuity will prevent its component from functioning.
Open circuit means ‘no continuity’. Function stops.
The S.I. unit of magnetic flux density is the.
Tesla.
A 1µF capacitor is equivalent to.
0.000,001 Farads.
The opposition offered by a coil to the flow of alternating current is called (disregarding resistance).
inductive reactance.
A shunt is used with.
an ammeter.
A shunt is used to change the working range of an ammeter, by ‘shunting’ around the ammeter, a major portion of the current being measured.
If a load in series has a current passing through it, the magnetic field can be worked out by using.
the corkscrew rule.
The unit for power is.
Joules per second.
Power = energy (joules) / time (seconds).
In conventional flow, the left hand rule applies to.
motors.
Remember MG - the British car manufacturers (MG left to right) - or remember geneRIGHTer.
When a conductor is cut by magnetic lines of force an EMF is induced. This is.
Faraday’s Law.
The Watt can be expressed as.
Joules per second.
The symbol for flux density is.
B.
To determine the direction of the magnetic field around a conductor you would use.
the corkscrew rule.
Switching on or off the current in one coil produces an emf in another coil adjacent to it. The two coils are said to have.
mutual inductance.
Self induced emf in a coil supplied with a current varying at a uniform rate can be found by.
-L dI / dt.
The property of a material to accept lines of flux is called.
permeability.
Magnetomotive force can be found by.
I * N.
The direction of induced conventional current in a wire rotating in a magnetic field can be determined by.
Fleming’s right hand rule.
How would you find the direction of the electron flow in an armature located in a magnetic field?
Flemings left hand rule.
What is the SI unit of conductance?
Siemen.
What is the SI unit of resistivity?
Ohm metre.
What is the formula for conductance? (R=Resistance).
1/R.
In electrical circuit, Direct Current power is represented by the.
Watt.
In S.I. units, work is denoted by.
Newton-meter which is Joules.
The unit of energy is the.
Joule.
Potential difference is another term for.
voltage.
XL is the symbol of.
inductive reactance.
What is the correct unit for measuring energy?
Joule
What is another term for potential difference?
voltage
What does the symbol XL represent?
inductive reactance
According to Ohm’s law, current is directly proportional to what?
the EMF
If one volt is induced into a circuit with a current varying at 1 amp per second, what does the circuit have?
1 Henry
What property of a conductor limits the flow of electric current?
resistance
Kirchhoff’s law is applicable to what type of networks?
closed loop networks
What is the SI unit of work?
Joule
From which law can the EMF of a generator be calculated?
Faraday’s law
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html
