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Static and current Electricty 💂🏽 Flashcards

1
Q

Polythene rod

A

Gains electrons

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2
Q

Perspex rod

A

Looses electrons

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3
Q

Earthing?

A

When a charged object looses its charge to the Earth through a conductor.

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4
Q

Static electricity?

A

Is a build up of electric charge that can occur on good insulators e.g. Polythene and perspex rods.

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5
Q

Electric current

A

Is a flow of electric charge

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6
Q

Conductors

A

Are substances which allow electric current to flow through them freely

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7
Q

Insulators

A

Are substances which do not allow electric current to flow through them

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8
Q

Closed circuit

A

Is needed for the current toflow, if there is a break in a circuit then the current wont flow.( the electrical energy cant get through)

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9
Q

Energy provided

A

Energy is provided by a battery or power pack, it is needed to move the current around the circuit

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10
Q

The battery pumps electrons

A

From its negative end around a circuit

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11
Q

The electrons are attracted

A

back to the positive end of the battery.

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12
Q

Potential differnece

A

The difference in electrical pressure between the positive and negitive ends of a battery/power pack

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13
Q

Whenever this is a potential difference

A

Electricity will flow

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14
Q

This potential difference is known as

A

Voltage and is measured in volts

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15
Q

Resistance

A

Is the opposition to the flow of electrons. The unit is ohm and it is measured using a ohmmeter

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16
Q

Resistor

A

If a resistor is placed im an electron circuit, it will slow down the flow of electrons

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17
Q

Ohm’s law?

A

Ohm’s law states that voltage is directly proportional to current.

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18
Q

DC

A

Direct current goes in one direction only.

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19
Q

AC

A

Alternating current changes very quickly many times a second

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20
Q

Mains supply

A

Is A.C, it flows at a potential difference of 230 volts

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21
Q

The ring circuit

A

Made if live neutral and earth wires. Sockets are tapped off at points along this ring circuit

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22
Q

Fuses

A

A fuse is a safety device that prevents the circuit from overheating. It will melt when it is too hot breaking the circuit

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23
Q

Circuit breaker

A

A circuit breaker is used in the fuse board of the home, and this trips, to stop the flow of current from entering the house

24
Q

Live wire

A

The live wire os brown and carries most electricity it is connected to the plugs fuse on the right hand side

25
Neutral wire
The neutral wire is blue and is connected to the left hand side
26
Earth wire
The earth wire is a safety wire, no electricity flows in the earth wire unless the appliance it is attached to becomes "live" E.g a toaster, in this case the earth wire would carry the current to the earth instead of you electrocuting yourself should you touch the toaster.
27
Watt
Is the unit of electrical power
28
ESB charges a fee for the number of ...
Kilowatts (1000 watts) used per hour
29
ESB's unit of electricity is ...
The kilowatt hour (kWh)
30
A kilowatt hour ...
Is the electrical energy used by 1kW appliance running for 1 hour.
31
Ohm's law?
Oh,'s law states that voltage is directly proportional to current.
32
DC
Direct current goes in one direction only.
33
AC
Alternating current changes very quickly many times a second
34
Mains supply
Is A.C, it flows at a potential difference of 230 volts
35
The ring circuit
Made if live neutral and earth wires. Sockets are tapped off at points along this ring circuit
36
Fuses
A fuse is a safety device that prevents the circuit from overheating. It will melt when it is too hot breaking the circuit
37
Circuit breaker
A circuit breaker is used in the fuse board of the home, and this trips, to stop the flow of current from entering the house
38
Live wire
The live wire os brown and carries most electricity it is connected to the plugs fuse on the right hand side
39
Neutral wire
The neutral wire is blue and is connected to the left hand side
40
Earth wire
The earth wire is a safety wire, no electricity flows in the earth wire unless the appliance it is attached to becomes "live" E.g a toaster, in this case the earth wire would carry the current to the earth instead of you electrocuting yourself should you touch the toaster.
41
Heating effect
Boil water in a kettle, immersion heater, electric cooker, fuse in plug
42
Chemical effects
Electroplating cheap metal with more expensive metal e.g. Silver , electrolysis (splitting) of water, mobile phone
43
Magnetic effect
Electromagnet made with a wire wrapped around a nail, electric motor, speakers, circuit speaker breaker in fuse board.
44
Electronics
Is the careful and exact control of tiny amounts of electric current.
45
Diodes
A diode is a component that will allow current to flow in one direction only.
46
Forward biased
If the positive end of the battery is connected to the positive end of a diode the diode is said to be "forward biased" and current can flow.
47
Reverse biased
If the positive end of the battery is connected to the negative end of the diode it is said to be "reversed boased" and no electricity can flow.
48
A diode can be used to...
Change alternating current into direct current
49
Electronic devices such as radios, tape recorders and calculators need....
Low voltage direct current
50
Light emitting diode is ....
A diode that gives out light when a current flows through it.
51
Current will only flow when LED is...
Forward biased
52
LEDs use only tiny currents so ...
A resistor must be connected in series with it.
53
LEDs are useful as they are...
Cheap, reliable and long lasting and use far less current than other light bulbs
54
An LDR is a...
Light dependent resistor
55
Light dependent resistor
Is a resistor whose resistance depends on light
56
When light falls on an LDR ..
Its resistance decreases, this low resistance will allow a current through the circuit.

Physics (8 decks)

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