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Electrical Fundementals > Electrical Terminology > Flashcards

Electrical Terminology Flashcards

1
Q

If a photon radiating into an electronic device causes the production of an electron/hole pair, the device is known as a.

A

photodiode.

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2
Q

Faraday’s Law States that.

A

the magnitude of the EMF is directly proportional to the rate of change of flux.

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3
Q

Which of the following is 1 Amp?

A

1000 mA.

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4
Q

The term that describes the combined resistive forces in an AC circuit is.

A

impedance.

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5
Q

Ohm’s law states that:

A

current = e.m.f. divided by resistance.

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6
Q

E.M.F. in an electric circuit corresponds to what in a magnetic circuit.

A

MMF.

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7
Q

In conventional current flow, what is Fleming’s right hand rule used for?

A

Generators.

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8
Q

The SI unit of work is.

A

Kilogram metres-force.

Work is measured in joules, which is Newton.metres or kilogram.metres force (since Newtons are kilograms force).

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9
Q

A coulomb is.

A

one ampere * second.

Current (amps) = charge (coulombs) per second. You do the transposition.

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10
Q

An electric current is a flow of.

A

electrons from a negatively charged area to a positively charged area.

Electrons flow from negative to positive.

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11
Q

A volt can be considered to be a.

A

unit of electrical pressure.

‘Electrical pressure’ is sometimes used instead of voltage, due to its analogy to a head of pressure in fluids.

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12
Q

What is 3.25 volts in millivolts?

A

3,250 millivolts.

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13
Q

Electromotive force is measured in.

A

Volts.

EMF is another term for voltage, or potential difference (PD) or electrical pressure, all measured in Volts.

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14
Q

Kirchhoff’s law states.

A

the algebraic sum of all the currents entering or leaving a series of components will be equal to one.

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15
Q

The basis for transformer operation in the use of alternating current is mutual.

A

inductance.

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16
Q

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.

A

mutual induction.

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17
Q

When an electrical supply becomes ‘open-circuit’.

A

the loss of continuity will prevent its component from functioning.

Open circuit means ‘no continuity’. Function stops.

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18
Q

The S.I. unit of magnetic flux density is the.

A

Tesla.

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19
Q

A 1µF capacitor is equivalent to.

A

0.000,001 Farads.

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20
Q

The opposition offered by a coil to the flow of alternating current is called (disregarding resistance).

A

inductive reactance.

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21
Q

A shunt is used with.

A

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.

22
Q

If a load in series has a current passing through it, the magnetic field can be worked out by using.

A

the corkscrew rule.

23
Q

The unit for power is.

A

Joules per second.

Power = energy (joules) / time (seconds).

24
Q

In conventional flow, the left hand rule applies to.

A

motors.

Remember MG - the British car manufacturers (MG left to right) - or remember geneRIGHTer.

25
Q

When a conductor is cut by magnetic lines of force an EMF is induced. This is.

A

Faraday’s Law.

26
Q

The Watt can be expressed as.

A

Joules per second.

27
Q

The symbol for flux density is.

A

B.

28
Q

To determine the direction of the magnetic field around a conductor you would use.

A

the corkscrew rule.

29
Q

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.

A

mutual inductance.

30
Q

Self induced emf in a coil supplied with a current varying at a uniform rate can be found by.

A

-L dI / dt.

31
Q

The property of a material to accept lines of flux is called.

A

permeability.

32
Q

Magnetomotive force can be found by.

A

I * N.

33
Q

The direction of induced conventional current in a wire rotating in a magnetic field can be determined by.

A

Fleming’s right hand rule.

34
Q

How would you find the direction of the electron flow in an armature located in a magnetic field?

A

Flemings left hand rule.

35
Q

What is the SI unit of conductance?

A

Siemen.

36
Q

What is the SI unit of resistivity?

A

Ohm metre.

37
Q

What is the formula for conductance? (R=Resistance).

A

1/R.

38
Q

In electrical circuit, Direct Current power is represented by the.

A

Watt.

39
Q

In S.I. units, work is denoted by.

A

Newton-meter which is Joules.

40
Q

The unit of energy is the.

A

Joule.

41
Q

Potential difference is another term for.

A

voltage.

42
Q

XL is the symbol of.

A

inductive reactance.

43
Q

What is the correct unit for measuring energy?

A

Joule

44
Q

What is another term for potential difference?

A

voltage

45
Q

What does the symbol XL represent?

A

inductive reactance

46
Q

According to Ohm’s law, current is directly proportional to what?

A

the EMF

47
Q

If one volt is induced into a circuit with a current varying at 1 amp per second, what does the circuit have?

A

1 Henry

48
Q

What property of a conductor limits the flow of electric current?

A

resistance

49
Q

Kirchhoff’s law is applicable to what type of networks?

A

closed loop networks

50
Q

What is the SI unit of work?

A

Joule

51
Q

From which law can the EMF of a generator be calculated?

A

Faraday’s law

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html

Electrical Fundementals (19 decks)

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