P4

Question 1

IF AN ATOM HAS NO CHARGE…

Answer 1

It has equal numbers of protons and electrons

Question 2

IF AN ATOM HAS A POSITIVE CHARGE…

Answer 2

Loss of electrons more protons then electrons

Question 3

IF ATOM HAS A NEGATIVE CHARGE….

Answer 3

Gain of electrons more electrons than protons

Question 4

WHAT IS STATIC ELECTRICITY?

Answer 4

Build up of charge on insulating materials

Question 5

HOW DOES STATIC ELECTRICITY HAPPEN?

Answer 5

When you rub two insulating materials together electrons are rubbed off one and passed onto the other

Question 6

HOW DO WE KNOW WHICH WAY ELECTRONS ARE TRANSFERRED?

Answer 6

We dont it depends on properties of the materials

Question 7

WHAT WAY DO FIELD LINES GO OUT ON POSITIVE CHARGED?

Answer 7

Outwards

Question 8

WHAT WAY DO FIELD LINES GO ON NEGATIVE CHARGED?

Answer 8

Inwards

Question 9

WHAT IS THE THREE RULES FOR OBJECTS WITH FIELD LINES

Answer 9

• They are non contact force so field and force between gets weaker as you get further away
  -Opposites attract so positive attracts a negative
  -Force inbetween is called electrostatic attraction

Question 10

WHAT IS CURRENT MEASURED BY?

Answer 10

An ammeter

Question 11

DEFINE CURRENT?

Answer 11

A measure of flow of electrons

Question 12

WHICH WAY DOES CURRENT FLOW?

Answer 12

From positive terminal of battery to negative terminal

Question 13

WHAT IS CURRENT MEASURE IN?

Answer 13

Amperes (A)

Question 14

WHAT IS THE EQUATION FOR CURRENT?

Answer 14

I= Q / t
Current= charge flow / time

Question 15

WHAT IS POTENTIAL DIFFERENC MEASURED WITH?

Answer 15

A voltmeter

Question 16

DEFINE POTENTIAL DIFFERENCE?

Answer 16

Force driving the flow of electrons
( provided by cell or battery )

Question 17

WHAT IS POTENTIAL DIFFERENCE MEASURED IN?

Answer 17

Volts ( V )

Question 18

WHAT IS THEEQUATION FOR POTENTIAL DIFFERENCE?

Answer 18

V= I x R
P.D = Current x Resistence

Question 19

WHAT IS RESISTENCE?

Answer 19

Everything that resists the flow of electrons

Question 20

WHAT IS RESISTENCE MEASURED IN?

Answer 20

Ohms

Question 21

WHAT IS THE EQUATION FOR RESISTENCE?

Answer 21

R = I / V
Resistance = Current / P.D

Question 22

WHAT IS CHARGE?

Answer 22

A measure of total current that flows with in a certain period of time

Question 23

WHAT IS CHARGE MEASURED IN?

Answer 23

Coulombs ( Q )

Question 24

WHAT IS THE EQUATION FOR CHARGE FLOW?

Answer 24

Q = I x t

charge flow = Current x time

Question 25

WHAT IS THE JOB OF A CELL?

Answer 25

pushes electrons around the circuit

Question 26

WHAT IS THE JOB OF A SWITCH?

Answer 26

Enables current in circuit to be switched on and off

Question 27

WHAT IS JOB OF FILAMENT LAMP?

Answer 27

emits light when current runs through it

Question 28

WHAT IS THE JOB OF AN AMMETER?

Answer 28

To measure electrons current

Question 29

WHAT IS THE JOB OF A VOLTMETER?

Answer 29

to measure potential difference

Question 30

WHAT IS JOB OF A FIXED RESISTOR

Answer 30

limits current in circuit

Question 31

WHAT IS JOB OF A VARIABLE RESISTOR?

Answer 31

allows current to be varied

Question 32

WHAT IS JOB OF A FUSE?

Answer 32

If current gets to high it is designed to melt and break circuit

Question 33

WHAT IS JOB OF A DIODE?

Answer 33

Only allows current to flow in one direction

Question 34

WHAT IS JOB OF A LDR?

Answer 34

Changes resistance due to intensity of light

Question 35

WHAT IS JOB OF THERMISTOR

Answer 35

Limits current in circuit based off temperature

Question 35

WHAT IS JOB OF A LED?

Answer 35

Emits light when current passes through it one way

Question 36

HOW MANY LOOPS DOES A SERIES CIRCUIT HAVE?

Answer 36

one loop

Question 37

IN A SERIES CIRCUIT HOW ARE THE COMPONENTS CONNECTED?

Answer 37

one after another

Question 38

IN A SERIES CIRCUIT HOW IS CURRENT SHARED?

Answer 38

It is same in every point of the circuit so ammeter can be placed anywhere

Question 39

IN A SERIES CIRCUIT HOW IS POTENTIAL DIFFERENCE SHARED?

Answer 39

P.D of battery is shared across all components - IF SAME COMPONENT SAME VOLTAGE - total= V1+V2+V3

Question 40

IN A SERIES CIRCUIT HOW DOES RESISTENCE WORK?

Answer 40

Total resistance is sum of resistance of all components

Question 41

HOW MANY LOOPS DOES A PARALLEL CIRCUIT HAVE?

Answer 41

more than one

Question 42

IF A LOOP HAS A GREATER RESISTANCE IN PARALLEL...

Answer 42

it will take less share of current

Question 43

IN A PARALLEL CIRCUIT HOW IS CURRENT SHARED?

Answer 43

Across loops in anyway

Question 44

HOW IS POTENTIAL DIFFERENCE SHARED IN A PARALLEL CIRCUIT?

Answer 44

every component gets full source of P.D

Question 45

HOW DOES RESISTENCE WORK IN A PARALLEL CIRCUIT

Answer 45

more components added in parallel resistance lowers

Question 46

WHY IS CURRENT SHARED ACROSS BRANCES IN A PARALLEL CIRCUIT

Answer 46

because different junctions so different amount of charge can flow through different components