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Science ( Sec 3 ) > Chapter 4 - Electricity > Flashcards

Chapter 4 - Electricity Flashcards

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1
Q

What are circuit diagrams

A

circuit digrams shows how electrical components are connected

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2
Q

what is the S.I unit for current

A

ampere

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3
Q

what is a smaller unit of current

A

milliampere ( 1A = 1000 mA )

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4
Q

how can we measure current

A

we can use a multimeter or an ammeter

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5
Q

what is voltage needed for?

A

voltage is needed for current to flow

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6
Q

what is the voltage symbol ?

A

V

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7
Q

what is the S.I unit for voltage

A

volt

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8
Q

what is a smaller unit of voltage

A

millivolt ( 1V = 1000 mV )

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9
Q

how can we measure voltage

A

we can use a multimeter and a voltmeter

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10
Q

What is resistance

A

resistance opposes the flow of current.

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11
Q

Higher the resistance ….

A

smaller the current

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12
Q

the symbol for resistance

A

R

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13
Q

what is the S.I unit for resistance

A

ohm

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14
Q

is a fixed resistor fixed

A

yes

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15
Q

is a variable resistor fixed

A

no. it can be adjusted

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16
Q

when the resistors are connected in series the effective resistance becomes

A

bigger

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17
Q

when resistors are connected in parallel the effective resistance becomes

A

smaller

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18
Q

we can measure resistance by using a

A

multimeter

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19
Q

how many paths can current flow in a series circuit?

A

one

20
Q

what are the disadvantages of using series

A
  1. All bulbs must be turned on & off at the same time
  2. when bulb blows, the others blow as well
  3. it is hard to identify the blown blub
21
Q

how many paths can current flow in a parallel circuit?

A

more than one

22
Q

what are the advantages of using parallel circuits

A
  1. each bulb can be turned on and off individually
  2. when one bulb is blown , the rest will still be light up
  3. it is easy to find the blown bulb
23
Q

we must handle electricity with care

A

true

24
Q

what happens if we are not careful with electricity

A

there will be electrical hazards

25
Q

what are the two common electrical hazards

A

electric shock and electrical fire

26
Q

what are the causes of these electrical hazards

A
  1. damaged insulation
  2. overheating of cables
  3. damp conditions
  4. poor or loose connections
27
Q

explain about damaged insulation

A

it is when the layer of insulation is used to cover the wires is damaged and when the bare wires are shown. whoever touches it will be electrocuted

28
Q

explain about overheating of cables

A

it is when too many appliances are plugged into a single main socket and the current flowing out will become large. this can result in electrical fire.

29
Q

explain about damp conditions

A

damp conditions is when the appliances are touched with wet hands. this can result in electric shock as water is a conductor of electricity

30
Q

explain about loose connections

A

this happens when exposed wires are touching each other. this can cause electrical fire and sparks can be produced at the points of loose connections

31
Q

what are the safety uses of electricity

A

this are used to protect us against these electrical hazards

32
Q

examples of the safety uses

A
  1. fuse
  2. earth wire
  3. circuit breaker
  4. double insulating wire
33
Q

what does a fuse do

A

a fuse is a safety device that prevents and overly large current from flowing. it is made up of a thin piece of copper in a case

34
Q

what does a circuit breaker do

A

it is a rectangular box that is that is located near the entrance in all houses. it also prevents and overly large current from flowing

35
Q

what does a earth wire do

A

it prevents and overly large current from flowing

36
Q

what is double insulating wire

A

it is 2 layers of insulation

37
Q

what color is live wire

A

brown

38
Q

what color is earth wire

A

yellow and green

39
Q

what color is neutral wire

A

blue

40
Q

what is electrical power

A

it is the rate at which electrical energy is converted to other forms of energy

41
Q

what is the S.I unit for electrical energy

A

watt ( W )

42
Q

a bigger unit for electrical energy

A

kilowatt ( kW )

43
Q

the energy formula

A

energy = power × time

44
Q

what does the label on electrical appliances tells us?

A

the volatge the appliance should be used with and the power rating of the appliance

45
Q

an appliance with high power rating can

A

help us get things done faster

46
Q

electrical power can be calculated by using power voltage and current the formula is …

A

Power ( W ) = Volts ( V ) × Current ( I )

Science ( Sec 3 ) (12 decks)

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