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Electrical > Carsouel 1 > Flashcards

Carsouel 1 Flashcards

1
Q

what is the charge of a neutron

A

neutral

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2
Q

which parts of the atom can move

A

electrons

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3
Q

what direction does an ac current move

A

There’s not set direction so it could either be positive to negative or negative to positive

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4
Q

what is resistance

A

a force that counteracts the current

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5
Q

if you connect 2 resistors in series will the current be different or the same across the two

A

the same although the current is reduced

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6
Q

if you connect 2 resistors in parallel will the current be different or the same

A

same

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7
Q

what does EMF stand for

A

Electrical Motive Force (open circuit voltage of a battery)

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8
Q

what happens to the voltage of a battery when a load is connected to it

A

Reduces due to internal resistance of the battery

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9
Q

if current flows away from you what direction does the magnetic field flow

A

anti-clockwise

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10
Q

if you increase the current what happens to the magnetic field

A

increases

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11
Q

what happens to an iron bar if you wrap a coil of wire around it and apply voltage

A

it’s converted into an electronic magnet

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12
Q

why’s it good practice to have the earth wire as the longest wire within a plug

A

as if the other wires are pulled out it prevents you from getting a shock as the current would be carried through the earth wire

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13
Q

four steps to test for dead

A
  1. check voltage indicator for any faults
  2. prove the lights illuminate when voltage is applied
  3. test all possible combinations
  4. prove that the voltage detector can still detect voltage
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14
Q

why is it good practice to have the sheath pretruding beyond the collar of the gland

A

to prevent a short circuit being produced due to friction within the cores removing the insulation

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15
Q

how much voltage would be across 3 different components within a parallel circuit

A

they would all receive the same voltage

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16
Q

a battery has an open circuit voltage what is this known as

A
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17
Q

what is eddy currents

A

loops of electrical current induced in a conductor by a varying magnetic field

18
Q

what is the rule for motors that gives the direction of current, field and motion

A

Left hand motor rule

19
Q

every conductor has a resistivity what does this mean

A

the amount of resistance that is applied against the supply

20
Q

two methods of increasing the output voltage of a generator

A
  1. speed
  2. number of coils
21
Q

why do we step up the voltage to very high voltage on the national grid

A

to reduce their loses

22
Q

what does RMS stand for

A

Root Mean Square

23
Q

what is the principle of rms on ac systems

A

value of steady current

24
Q

what is rectification

A

changing AC to DC

25
Q

what does a diode do

A

only allows the flow of current in one direction only

26
Q

what charge does the electron have

A

negative

27
Q

what is static electricity

A

caused by friction positively or negatively charging a part of the body

28
Q

difference between ac and dc

A

dc is a direct current
ac is an alternating current

29
Q

difference between voltage and current

A

current is the flow of electrons throughout the circuit
voltage is the charge that the electrons have within them

30
Q

what happens when you select ohms on a multimeter

A

the meter has become a power source

31
Q

when you select amps what happens on a multimeter

A

the meter has low resistance

32
Q

what happens when you select volts on a multimeter

A

the meter has high resistance

33
Q

Tesla

A

density

34
Q

weber

A

strength

35
Q

henry

A

amount

36
Q

what is the standard unit for a capacitor

A

Farad

37
Q

three common uses of a capacitor

A

energy storage
power conditioning
signal processing

38
Q

what is frequency

A

how many of those periods happen within a second

39
Q

harmonised colours

A

brown black grey and blue as neutral

40
Q

pre harmomised colours

A
41
Q

what is emf

A

open circuit of a battery

Electrical (1 decks)

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