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Physics > P3- Electricty > Flashcards

P3- Electricty Flashcards

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1
Q

define static electricty

A

The build up of charge in insulating materials

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2
Q

what happens when static electricty is dischared

A

sparks are produced

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3
Q

Do all objects have charge?

A

Yes but most object cancel out as they have an even amount of negitve and positve cancel each other out

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4
Q

What happnes when two insulating objects are rubbed together

A

The friction causes electrons to be rubbed off onto the other one

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4
Q

What happnens when two conducting materials are rubbed together

A

The charge lost travels back into the orginal object

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5
Q

can static electricity be built up in conducting materials

A

No it cant

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6
Q

What sub atomic particles are transfered when friction is created

A

Only electrons are transfered

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7
Q

What happens when the negtive charge builds up on an insultating object

A

A potenial difference is created between the negtively cahrged obejct and the earth (or any other earthed object)

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8
Q

What is the charge of an earthed object

A

0Volts

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9
Q

What happens when the potential difference between an earthed object and an insulator becomes large

A

Electrons ‘jump’ between the gap which create sparks

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10
Q

Can charge build up on conducting materials

A

Sometimes- although it is uncomen

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11
Q

What is an example of charge building up on a conducting material

A

A car creating friction between the wind as it drives

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12
Q

Do all charged obeject have an electrical field

A

Yes

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13
Q

Which way do elecrical field lines point

A

Positve to negitive
(positive point outwards, negitive point inwards)

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14
Q

How must electrical field lines be drawn

A

At a right angle to the surface

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15
Q

Where is a electrical field strongest

A

Clostest to the object

16
Q

Where is the electrical field weaker

A

furhter away from the object

17
Q

What happens when charged particles become closer

electrical fields

A

There electrical fields become stonger

18
Q

What is the name of the force that attracts two particles together

A

Electrostatic force (or attraction)

19
Q

Is air an insulator or a conductor

A

Its an electriacal insulator

20
Q

What happens when air comes into contact with a strongly charged object

A

The air ionises(loses electrons) which causes the air to become a conductor and allows electrons to travel through as sparks

21
Q

Define Coulomb

A

The unit of charge.

22
Q

Diode

A

A component that only allows current to flow through in the forward direction. They
have very large resistances in the reverse direction.

23
Q

Electric Current

A

The rate of flow of electrical charge. Its value is the same at any position in
a single closed loop. In metals, the charges that flow are electrons.

24
Q

Filament Lamp

A

A light emitting component consisting of an enclosed metal filament. Its
resistance increases as the filament’s temperature increases.

25
Q

Light Dependent Resistor (LDR)

A

A light sensitive component whose resistance decreases
as its temperature increases.

26
Q

Light Emitting Diode

A

A device that gives out light when a current flows through it. Current
can only flow through it in one direction, and a minimum voltage must be applied across it
before it illuminates.

27
Q

Ohms

A

The unit of resistance.

28
Q

Ohm’s Law

A

The current flowing through an Ohmic conductor at constant temperature is
directly proportional to the potential difference across it.

29
Q

Potential Difference

A

The energy that is transferred per unit charge between two points in a
circuit. It is often also called a voltage.

30
Q

Power

A

The rate at which an appliance transfers energy. For a circuit component, it is equal
to the product of the current passing through it and the potential difference across it.

31
Q

Resistors in Parallel

A

The total resistance is less than the lowest individual resistance.

32
Q

Resistors in Series

A

The total resistance is equal to the sum of the resistances of the individual resistors.

33
Q

Series circit

A

Components connected in series have the same current passing through each
component but share the total potential difference of the power supply.

34
Q

Thermistor

A

A temperature dependent component, whose resistance increases as its
temperature decreases

35
Q

Volt

A

The unit of potential difference. One volt is equal to one joule per coulomb.

36
Q

Watt

A

The unit of power.

Physics (11 decks)

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