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Physics > Electricity > Flashcards

Electricity Flashcards

1
Q

Static electricity

A

A stationary electric charge typically caused by friction, which causes sparks,crackling or attraction of dust/hair

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2
Q

Examples

A

Rub pen on jumper to make water move

Van de Graaff generator to make hair stand up

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3
Q

Negatively charged

A

Objects gain electrons

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4
Q

Positively charged

A

Objects lose electrons

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5
Q

Like charges

A

Repel each other

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6
Q

Opposite charges

A

Attract

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7
Q

Insulator

A

Charge doesn’t travel through eg plastic

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8
Q

Conductor

A

Charge can travel through eg metal

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9
Q

Polythene rod

A

Gains electrons if a woollen cloth is rubbed on it

Becomes negatively charged

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10
Q

Perspex rod

A

Loses electrons if a woollen rod is rubbed on it

Becomes positively charged

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11
Q

Earthing

A

Occurs when a charged object loses its charge to the earth through a conductor

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12
Q

Electric current

A

Caused by the flow of electrons through a good conductor eg metal

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13
Q

Good insulator

A

Does not allow electric current to flow

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14
Q

Electrical energy can be converted into

A

Light -> see in the dark
Heat -> cook and heat buildings
Kinetic -> electric motors
Sound -> music

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15
Q

Potential difference

A

Difference in electrical pressure between positive and negative ends
Wherever this is electricity will flow
Known as voltage and measured in volts

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16
Q

Resistance

A

Opposition of the flow of electrons
Unit is Ohm
Measured using an Ohmmeter
If a resistor is placed in an electrical circuit it will slow down the flow of electrons

17
Q

Use of resistors

A

Light bulb filament

Heating coil of a kettle

18
Q

Bulbs in series

A

The same amount of current flows through each bulb in a series
The voltage is split up depending on the size of the bulb

19
Q

Bulbs in parallel

A

Lights in your house are connected in parallel
Current is split between the bulbs, if the same size its split evenly
Same voltage flows through each bulbs
Turning one off will not affect the other

20
Q

Which is brighter

A

Bulbs in parallel

Physics (5 decks)

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