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Physics > Electricity > Flashcards

Electricity Flashcards

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1
Q

what is the definition of emf

A

a voltage where the charge is gaining energy
(maintains the potential energy difference across the ends of the circuit)

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2
Q

what is potential difference

A

the difference between two ends of the circuit.
as the work done per unit positive charge

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3
Q

what is current

A

the flow of charge

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4
Q

which way do electrons flow in a circuit

A

from the negative pole to the positive pole of the cell

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5
Q

what is resistance

A

the components of the circuit, a measure of the opposition to current flow in an electrical circuit.

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6
Q

how do you calculate emf in a series circuit

A

Total emf = sum of individual emf

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7
Q

how to calculate the emf in the parallel circuit

A

the emf is the same as the emf in the single cell

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8
Q

what is a electric current

A

a flow of charged particles

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9
Q

what is used to measure current,
what is the SI unit of current

A

ammeter
ampere (A)

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10
Q

what is the SI unit of charge

A

coloumb

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11
Q

what is a coloumb

A

the amount of charge that passes through a point in a circuit

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12
Q

what happens to the energy so it can flow through a circuit

A

electrical potential energy of the battery => kinetic energy of charge

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13
Q

what are the two conditions in order for the charge to flow in the circuit

A

1) the circuit must be closed
2) there must be a source of potential energy=> kinetic energy ( o be able to move through the circuit)

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14
Q

what is the potential difference

A

the difference in electric potential energy that is transferred per unit charge

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15
Q

what is the SI unit of potential difference

A

volt (v)

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16
Q

what is a voltmeter

A

measures potential difference (in volts)
connected in parallel

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17
Q

what is the conventional current

A

the direction of positive flow of positive charge to negative

18
Q

what is a resistance

A

resistance of a conductor is the materials opposition to the flow of charge

19
Q

what is the SI unit for resistance

A

ohms

20
Q

what is an emf

A

the total amount of electrical energy that it (battery) supplies per unit charge passing through it

21
Q

what type of resistance does a flat battery have

A

high internal resistance

22
Q

what type of resistance does a full battery have

A

low internal resistance

23
Q

what does a parallel circuit do to current

A

it divides the current

24
Q

what are the factors affecting resistance of a conductor

A

1) CROSS - sectional area
wide = easier(less resistance) / narrow = difficult
2) LENGTH - how long the conductor is
long=harder (more resistance)/ short= easier
3) TEMPERATURE - Increase in resistance= increase in resistance
4) TYPE OF METAL(metallic composition)

25
Q

what is the principle of conservation of charge

A

it states that the net charge of an isolated system remains constant during any physical process

26
Q

what is a magnet

A

a magnet is an object which has opposite magnetic poles at each end

27
Q

what are the three magnetic metals

A

iron
cobalt
nickel

28
Q

what are the poles of a magnet called

A

south and north pole

29
Q

what happens when a magnet is broken into half

A

it creates two magnets

30
Q

what is a permanent magnet
example

A

its a magnet that remains (keeps) its magnetism
bar magnets

31
Q

what is a temporary magnet
example

A

it’s a magnet that does not retain its magnetism
electromagnets

32
Q

why are electromagnets tempomporary magnets

A

they lose their magnetism when electricity is turned off

33
Q

what is a magnetic field

A

a region in space in which a magnet/ferromagnetic material will experience a force which is magnetic in nature

34
Q

what is ferromagnet

A

alloy

35
Q

a

A
36
Q

what are field lines

A

show the direction of the force that an iron filling would experience at a particular point in the field

37
Q

which poles attract

A

opposite poles attract

38
Q

which poles repel

A

same poles repel

39
Q

which pole is a terminate
which pole is an originate

A

North
south

40
Q

from which direction does the force go

A

from north to south

41
Q

what is magnetic declination

A

check pg 93

Physics (4 decks)

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