Paper 1

Question 1

Name 5 electrical components

Answer 1

LED light emitting diode
LDR light dependant resistor
Fixed resistor
Variable resistor
Thermistor
Fuse
Diode
any other

Question 2

What does LED do?

Answer 2

Emit light when current is flown through forward direction

Question 3

What does diode do?

Answer 3

Allow current to flow through one direction

Question 4

What does LDR do?

Answer 4

Change resistance due to light intensity
High intensity leads to low resistance

Question 5

What does a Thermistor do?

Answer 5

Change resistance due to temperature
High temperature lead to low resistance

Question 6

Why cant device work with open switch?

Answer 6

As circuit is not closed/complete so current can not flow through

Question 7

What does a fuse do?

Answer 7

Heats up and melt breaking the circuit so surge (high current can not flow through to person

Question 8

What is blue wire and function?

Answer 8

Neutral wire that carries current away from device completing circut

Question 9

What is brown wire and function?

Answer 9

Live wire that carries current to device

Question 10

What is green wire and function?

Answer 10

Earth wire that acts as an alternative pathway for current to flow away from the device if there’s a surge preventing an electric shock

Question 11

Adaptation of wire?

Answer 11

Copper to conduct electricity
Insulating plastic around wire to act as protection

Question 12

What is a.c and d.c?

Answer 12

A.c is the reverse flow in direction of current in circuit due to alternating pd
D.c is current flow in one direction in circuit

Question 13

Advantages and disadvantages to fuse?

Answer 13

Cheap
Simple
Non reuseable

Question 14

What is a circuit breaker and dis/advantages?

Answer 14

Switches off circut when surge of current
Expensive
Reuseable

Question 15

Why is a device not needed to be earthed if double insultated?

Answer 15

As acts as protection to electric shock since cant conduct electricity

Question 16

What is static electricity?

Answer 16

Build up of charge in insulting materials

Question 17

What happens when a rod rubs on a cloth?

Answer 17

Electrons rub off onto rod as attracted giving rod overall Negative charge
Cloth becomes positively charged as Electrons rub off so majority positively charged

Question 18

Why does spark happen?

Answer 18

As build up of negative charge in object causes electrons to jump between negatively charged object and earthed object (0v) and large difference in potential difference

Question 19

What arrows are on positively and negatively charged objects?

Answer 19

Negative - towards you arrows
Possitive - outward arrows

Question 20

What is internal energy?

Answer 20

The energy stored by the made up of particles in a substance

Question 21

The ____ internal energy, the _____ the temperature

Answer 21

More, higher

Question 22

What is specific heat capacity?

Answer 22

The amount of energy needed to heat 1kg of a subby 1⁰c

Question 23

What is specific latent heat?

Answer 23

The exact amount of energy needed to break bonds till change of state without changing the temperature

Question 24

Where does conduction happen?

Answer 24

In solids

Question 25

What is conduction?

Answer 25

The vibrating of particles transferring heat and kinetic energy through collisions

Question 26

Where does Convection happen?

Answer 26

Fluids

Question 27

What is convection?

Answer 27

The heating of fluids so particles move fast through diffusion

Question 28

What is the convection current?

Answer 28

The cycle of heating particles in a fluid as heated particles diffuse, pushing colder particles to area of heat where they heat up and diffuse, creating cycle

Question 29

How do you prevent convection?

Answer 29

By stopping the flow of fluid e.g. wearing blanket