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electrical Installation > Principles Of Electricity > Flashcards

Principles Of Electricity Flashcards

1
Q

What is the smallest part of any material?

A

Molecule

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2
Q

What charge are protons?

A

Positively charged

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3
Q

What charge are electrons?

A

Negatively charged

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4
Q

In an electrically neutral atom the number of …….. is equal to the number of ……….

A

Protons , electrons

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5
Q

What is the simplest atom?

A

Hydrogen

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6
Q

How many protons and electrons are in the helium atom?

A

2

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7
Q

What is electric current?

A

Random free electron movement

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8
Q

What is the resultant electron flow around the circuit called?

A

Electric current

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9
Q

What 2 ways can fractions be classified in?

A

Vulgar fractions and decimal fractions

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10
Q

What is a conductor?

A

Anything that allows electrons to flow

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11
Q

What are 4 good conductors?

A

Aluminium
Copper
Brass
Silver

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12
Q

What is 4 good insulators?

A

Rubber
Glass
Plastic
Diamond

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13
Q

What are 3 effects of an electric current?

A

Thermal effect
Chemical effect
Magnetic effect

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14
Q

How do you work out efficiency?
Output=3kw
Input =3.7kw

A

Efficiency = output / input x 100% = 3000 W / 3700 W x 100 = 0.8108 x 100 =

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15
Q

What is a single phase circuit?

A

1 live brown
1 neutral blue
1 earth green and yellow

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16
Q

What is a 3 phase circuit?

A

L1 brown
L2 black
L3 grey
1 neutral blue
1 earth green/ yellow

17
Q

How can the magnetic flux set up by a current through a coil of wire be reversed?

A

Reversing the direction of the current through the coil

18
Q

How many diodes are used in a full wave bridge rectifier?

19
Q

What is the resistance of an electrical conductor directly proportional to?

20
Q

What volume is used to measure resistivity for a given material

21
Q

What is the formula used to determine mechanical power?

A

Power = Mass x gravity x distance / time

22
Q

What does an ohmmeter measure?

A

Resistance

23
Q

What does an ammeter measure?

24
Q

What does a wattmeter measure?

25
Q

What does a voltmeter measure?

26
Q

What is the SI unit for magnetic flux?

27
Q

What is the SI unit for inductance?

28
Q

What is the SI unit for magnetic flux density?

29
Q

What is the SI unit for capacitance?

30
Q

What is the unit for flux density?

31
Q

What is the unit for flux density?

32
Q

What are class 1 levers?

A

The fulcrum is in the middle
The effort is on one side of the fulcrum and the resistance / load is on the other

electrical Installation (10 decks)

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