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physics n5 > Electricity > Flashcards

Electricity Flashcards

1
Q

charge (Q)

A

Can either be positive or negative, tells us how it will be affected in a electric field,

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2
Q

The units of charge

A

Coulombs (C)

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3
Q

current (I)

A

The measure of electric charge transferred per unit of time

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4
Q

Units of current

A

Amperes (A)

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5
Q

potential difference

A

The measure of energy given to the charge carriers in a circuit

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6
Q

What is potential difference sometimes called

A

Voltage

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7
Q

Unit of potential difference

A

Volt (V)

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8
Q

resistance (R)

A

The measure of opposition to the transfer of current

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9
Q

Unit of resistance

A

Ohms (Ω)

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10
Q

power (P)

A

The measure of energy transferred to an electrical component per unit of time

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11
Q

Unit of power

A

Watts (W)

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12
Q

Energy

A

Energy is the capacity for an object to do work, it is a concept used to explain why certain things happen

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13
Q

Unit of energy

A

Joule J

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14
Q

Alternating current

A

AC is when the transfer of charge rapidly swaps direction

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15
Q

Example of AC supply

A

Uk mains electricity

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16
Q

Direct current (DC)

A

DC is when the transfer of charge remains constant in one direction,

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17
Q

Electric field

A

An electric field is a region in which a charged particle would experience a force.

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18
Q

Charged particle

A

A charged particle is a particle with a charge, examples of these are positively charged protons and negatively charged electrons

19
Q

Conductor

A

A conductor is a material where charge is able to flow

20
Q

Insulator

A

A material where charge is not able to flow

21
Q

Ohms law

A

Ohms law states that as potential differance across a resister increases the current will also increase V=IR

22
Q

V=IR

A

Potential difference = current x resistance

23
Q

Multi meter

A

A device used to measure various values of a circuit

24
Q

Ammeter

A

A device used to measure the current at a point in the circuit,must be connected in series

25
Q

Voltmeter

A

Used to measure the potential difference across a component in the circuit, must be connected in parallel

26
Q

Cell

A

A single source of electrical energy, DC power source

27
Q

Battery

A

Multiple cells connected in series

28
Q

Lab pack

A

A power supply with variable voltage, can either be AC or DC

29
Q

Resistor

A

Component used to oppose the transfer of current in a circuit

30
Q

Diode

A

A device which will only allow charges to be transferred in one direction

31
Q

Q= IT

A

charge(C) = current(A)× time(s)

32
Q

The rules of series circuits

A

Current stays the same at all points
Voltage adds up to supply
Resistance adds up to total

33
Q

Parallel circuit rules

A

Current adds up to supply
Voltage stays the same at all points
Resistance = 1/RT = 1/R1= 1/R2 = ans Rt= 1/ans

34
Q

Rules of charge

A

Opposite charges attract
Like charges repel

35
Q

What surrounds all charged particles

A

Electric field

36
Q

Example of a conductor

A

Aluminium, steel, gold, copper, silver, graphite

37
Q

Example of a insulator

A

Plastic, glass, rubber, wood, air, oil

38
Q

Fuse ratings

A

3A for appliances of power less than 720W and 13A for appliances greater than 720W

39
Q

Resistance in parallel

A

1/Rt = 1/R1 = 1/R2 ans 1/Rt

40
Q

V2=(R2/R1+R2)VS

A

Pd across2 = ( resistance2/ resistance1+ resistance2)*pd across supply

41
Q

V1/V2= R1/R2

A

Potential difference1/potential difference2 = resistance1/resistance 2

42
Q

Rt=R1+R2

A

Total resistance in series

43
Q

P =E/T

A

Power(W) = energy(J)/time(sec)

44
Q
A

physics n5 (4 decks)

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