Electricity

Question 1

what is the definition of emf

Answer 1

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

Question 2

what is potential difference

Answer 2

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

Question 3

what is current

Answer 3

the flow of charge

Question 4

which way do electrons flow in a circuit

Answer 4

from the negative pole to the positive pole of the cell

Question 5

what is resistance

Answer 5

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

Question 6

how do you calculate emf in a series circuit

Answer 6

Total emf = sum of individual emf

Question 7

how to calculate the emf in the parallel circuit

Answer 7

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

Question 8

what is a electric current

Answer 8

a flow of charged particles

Question 9

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

Answer 9

ammeter
ampere (A)

Question 10

what is the SI unit of charge

Answer 10

coloumb

Question 11

what is a coloumb

Answer 11

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

Question 12

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

Answer 12

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

Question 13

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

Answer 13

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)

Question 14

what is the potential difference

Answer 14

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

Question 15

what is the SI unit of potential difference

Answer 15

volt (v)

Question 16

what is a voltmeter

Answer 16

measures potential difference (in volts)
connected in parallel

Question 17

what is the conventional current

Answer 17

the direction of positive flow of positive charge to negative

Question 18

what is a resistance

Answer 18

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

Question 19

what is the SI unit for resistance

Answer 19

ohms

Question 20

what is an emf

Answer 20

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

Question 21

what type of resistance does a flat battery have

Answer 21

high internal resistance

Question 22

what type of resistance does a full battery have

Answer 22

low internal resistance

Question 23

what does a parallel circuit do to current

Answer 23

it divides the current

Question 24

what are the factors affecting resistance of a conductor

Answer 24

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)

Question 25

what is the principle of conservation of charge

Answer 25

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

Question 26

what is a magnet

Answer 26

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

Question 27

what are the three magnetic metals

Answer 27

iron cobalt nickel

Question 28

what are the poles of a magnet called

Answer 28

south and north pole

Question 29

what happens when a magnet is broken into half

Answer 29

it creates two magnets

Question 30

what is a permanent magnet example

Answer 30

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

Question 31

what is a temporary magnet example

Answer 31

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

Question 32

why are electromagnets tempomporary magnets

Answer 32

they lose their magnetism when electricity is turned off

Question 33

what is a magnetic field

Answer 33

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

Question 34

what is ferromagnet

Answer 34

alloy

Question 35

a

Question 36

what are field lines

Answer 36

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

Question 37

which poles attract

Answer 37

opposite poles attract

Question 38

which poles repel

Answer 38

same poles repel

Question 39

which pole is a terminate which pole is an originate

Answer 39

North south

Question 40

from which direction does the force go

Answer 40

from north to south

Question 41

what is magnetic declination

Answer 41

check pg 93