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Electrical Installation > Science 103 Outcomes 1-6 > Flashcards

Science 103 Outcomes 1-6 Flashcards

1
Q

What is the SI Unit for Volume?

A

Cubic metres

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2
Q

What is the SI Unit for density?

A

kilogram per metre

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3
Q

What is the SI Unit for velocity?

A

metres/second

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4
Q

What is the SI Unit for resistance?

A

Ohms

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5
Q

What is the SI Unit for resistivity?

A

Ohm metre

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6
Q

What is the symbol for resistivity ?

A

p (weird p) Rho

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7
Q

What is the SI Unit for impedance ?

A

Ohms

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8
Q

What is the SI Unit for inductance ?

A

Henry

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9
Q

What is the SI Unit for inductive reactance? (xL)

A

ohms

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10
Q

What is the SI Unit for capacitance?

A

Farad

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11
Q

What is the SI Unit for capacitive reactance? ( Xc)

A

Ohms

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12
Q

What is the SI Unit for Reactive power?

A

Volt ampere reactive VAR

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13
Q

What is the SI unit for apparent power?

A

Volt amps VA

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14
Q

What do I need to remember about the current in a mixed series + parallel circuit ?

A

when it gets to the parallel part it will divide up equally to each resistor

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15
Q

Ohms law formula

A

V= I x R

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16
Q

Formula for resistance in a parallel circuit

A

1/RT = 1/R1 + 1/R2 + 1/R3

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17
Q

Formula for resistance in a series circuit

A

RT = R1 + R2 + R3

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18
Q

Name the two power formulas

A

P = V x I
or
P = I^2 x R

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19
Q

Formula for efficiency

A

Weird n = OUTPUT/INPUT

20
Q

Formula to find input using efficiency and output

A

INPUT = OUTPUT/efficiency

21
Q

What is voltage drop?

A

The decrease of electrical potential along the path of a flowing current in a circuit (due to resistance)

22
Q

In a circuit the sum of the volt drops should add up to…

A

the total voltage

23
Q

What are the three basic rules of magnetism?

A
  • lines of flux cannot cross
  • lines of flux flow from north to south
  • like poles repel
24
Q

What does a cross represent?

A

Current flowing away

25
Q

What does a little dot represent?

A

Current flowing towards

26
Q

How do you calculate the flux density?

A

B= flux density x area

27
Q

What is flux density (as in number of lines) measured in?

28
Q

What is flux density measured in? normal

29
Q

How do you calculate the frequency in AC generation?

A

f = N(speed in revs per sec) x no of pole pairs

30
Q

Explain the left hand rule

A

Thumb - direction of conductor
first finger - field (N on your palm)
Second finger - current

31
Q

How do you calculate mechanical force on the conductor?

A

F = B(flux density) x I (current) x length

32
Q

What is the purpose of a thyristor in the alarm circuit?

A

It operates the sounder

33
Q

What is the purpose of the capacitor in a telephone socket?

A

It forms part of the ringer circuit

34
Q

What is the purpose of the bridge rectifier in the motor control circuit?

A

It converts AC to DC

35
Q

In the thermostat what is the purpose of the thermistor?

A

It detects the temperature in order to turn appliances on and off using resistance

36
Q

In the dimmer switch, what is the purpose of the DIAC?

A

To trigger the DIAC

37
Q

What is a thermistor?

A

A type of resistor that varies with temperature

38
Q

What is a diode?

A

Allows current to pass in only one direction

39
Q

What is a thermistor?

A

A device that conducts when its gate receives a current trigger

40
Q

Which device converts AC to DC?

A

A rectifier

41
Q

What is impedance measured in?

42
Q

What effect is electroplating?

43
Q

What is the SI unit for resistivity?

A

(littlehorseshoesymbol)m

44
Q

What is a crowbar an example of?

A

A class I lever

45
Q

What is the effect if a motor is connected to a cable with an extremely high resistance?

A

There will not be enough voltage to operate the motor

46
Q

What is magnetic flux density?

A

the amount of flux in a given area

47
Q

How do we calculate the induced EMF within a conductor?

A

E =v x B x i

Electrical Installation (3 decks)

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