P3

Question 1

how does static electricity work

Answer 1

the electrons are transferred from one object to another to create a static field and even make sparks or shocks

Question 2

do similar charges repel or attract

Answer 2

repel

Question 3

do opposite charges repel or attract

Answer 3

attract

Question 4

what is the force known as between the objects if they repel

Answer 4

electrostatic repulsion

Question 5

what is the force known as between the objects if they attract

Answer 5

electrostatic attraction

Question 6

can the current in a circuit flow in an open circuit

Answer 6

no

Question 7

what is the electric current

Answer 7

it is the rate of flow of electrical charge

Question 8

what is the value in a single closed loop

Answer 8

the value is the same everywhere

Question 9

what is potential difference (voltage)

Answer 9

it is the driving force that pushes the charge around

Question 10

what is resistance

Answer 10

it is anything that resisters the flow of charge

Question 11

how do you work out the charge of a circuit

Answer 11

current (A) X time (s)

Question 12

how do you work out the p.d.

Answer 12

current (A) X resistance

Question 13

what is V = IR

Answer 13

ohms law

Question 14

what is a linear component

Answer 14

when it has Constance resistance

Question 15

what is a non-linear component

Answer 15

their resistance changes depending on the size of the current flowing through them

Question 16

does a current flow through a diode in one or more directions

Answer 16

one direction

Question 17

how to work out the p.d. in a circuit

Answer 17

work done/charge

Question 18

how to work out energy transferred in a circuit

Answer 18

charge X p.d.

Question 19

how to work out power in a circuit

Answer 19

energy (J) / time (s)

Question 20

how to work out power using the p.d.

Answer 20

p.d. (V) X current (A)

Question 21

how to work out power using resistance

Answer 21

current2 (A2) nX resistance (R)

Question 22

how to find p.d. in a parallel circuit

Answer 22

V1 = V2 = V3

Question 23

how to find the current in a parallel circuit

Answer 23

I = I1 + I2

Question 24

what is a permanent magnet

Answer 24

it is a magnet that can’t be turned on or off it is just always on

Question 25

what is an induced magnet

Answer 25

it is a magnet that can be turned on or off

Question 26

how to make an induced magnet turn on

Answer 26

you can turn on an induced magnet when you put it in a magnetic field

Question 27

what is a solenoid

Answer 27

it is a coil of wire

Question 28

how do you increase the strength of a solenoid

Answer 28

by increasing the current or more coils of wire

Question 29

what is THE RIGHT HAND RULE

Answer 29

using your right hand, point you thumb in the direction of the current and curl your fingers. the direction your fingers are pointing is the direction of the field

Question 30

what does FLEMING’S LEFT-HAND RULE show

Answer 30

it is used to find the direction of the force on a current-carrying conductor that is at right-angles to a magnetic field

Question 31

how to calculate the force

Answer 31

magnetic flux density X current X length of conductor

Question 32

examples of uses of electric motors

Answer 32

factories, electric vehicles and household appliances

Question 33

what is electromagnetic induction

Answer 33

it’s the induction of a p.d. across a conductor which is experiencing a change in magnetic field

Question 34

what current do dynamos create

Answer 34

a direct current

Question 35

what current do alternators create

Answer 35

an alternating current

Question 36

what are oscilloscopes used for

Answer 36

to see p.d. generated in the coil that changes over time

Question 37

what is a step-up transformer and how

Answer 37

it takes low volts and turns it into high volts. it starts with low amount of coils to take in the low voltage and gets flipped over to the other side with more coils on the iron core and this turns it into a high voltage to reduce loss of energy when transported across the country

Question 38

what is a step-down transformer

Answer 38

it takes high volts and turns it into low volts. it starts with high amount of coils to take in the high voltage and gets flipped over to the other side with less coils on the iron core and this turns it into a low voltage to make safer use across the country in homes

Question 39

calculations for transformers

Answer 39

p.d. across primary coil/p.d. across secondary coil = number of turns on primary coil/number of turns on secondary coil

Question 40

calculation of transformers

Answer 40

p.d. across primary coil X current in primary coil = p.d. across secondary coil X current in secondary coil

Question 41

true or false thew attraction of two charged objects is a non contact force

Answer 41

true

Question 42

name the particles whose movement can cause static charge to build up

Answer 42

electrons

Question 43

describe how the strength of the electric field of a charged object varies with the distance from the object

Answer 43

as the distance increases from the charged object increases the strength of its electric field decreases

Question 44

describe the force between two charged objects changes as you move them further apart

Answer 44

the force become smaller

Question 45

what is is meant by current

Answer 45

the rate of flow of electric charge

Question 46

true or false current will only flow through an electrical component in a circuit if there is a source of potential difference in the circuit and the circuit is closed

Answer 46

true