Electricty

Question 1

What is current

Answer 1

Flow of electrical charge

Question 2

Current equation

Answer 2

Charge/time

Question 3

Current and resistance relationship

Answer 3

The greater the resistance across the component,the smaller the current that flows through it

Question 4

Charge definition

Answer 4

The size of a current is the rate of flow of charfe

Question 5

Charge equation

Answer 5

Time * current

Question 6

Ohms law definition

Answer 6

Electric current is proportional to voltage and inversely proportional to resistance

Question 7

Ohms law equation

Answer 7

V=IR

Question 8

What is pd/voltage

Answer 8

The difference of energy in electrons between points while travelling round the circuit

Question 9

Ohmic conductor

Answer 9

The resistance of an ohmic conductor doesn’t change with the current

Question 10

LDRs and resistance

Answer 10

When light intensity increases the resistance decreases

Question 11

Thermistors and resistance

Answer 11

As the temperature increasing the resistance decreases

Question 12

Series circuit

Answer 12

Components are connected from positive to negative terminal in one loop

Question 13

Series circuit and pd

Answer 13

Scared to each component so always equal source pd
V=v1+v2

Question 14

Series circuit and current

Answer 14

Current is same everywhere
I=I1=i2

Question 15

Series circuit and resistance

Answer 15

Resistance adds up
R=r1+r2

Question 16

Parallel circuit

Answer 16

Each component is connected separately to the positive and negative terminal

Question 17

Voltmeter in circuit

Answer 17

Connected parallel always

Question 18

Ammeter in circuits

Answer 18

Always connected in series

Question 19

Parallel circuits and pd

Answer 19

Shared equally to all components

Question 20

Parallel circuits and current

Answer 20

Shared between branches

Question 21

Parallel circuits and resistance

Answer 21

Adding a resistor in parallel reduces total resistance

Question 22

Alternating current definition

Answer 22

Current ur constantly changing direction

Question 23

Mains frequency and voltage

Answer 23

F=50hz v=230v

Question 24

Direct current

Answer 24

Current flows sane direction from positive to negative terminal

Question 25

Neutral wire

Answer 25

Carries current out of circuit

Question 26

Live wire

Answer 26

Carries current into device

Question 27

Earth wire

Answer 27

Stops applicable from becoming live

Question 28

Energy transferred and power equation

Answer 28

Energy transferred = power* time

Question 29

Energy transferred and PD equation

Answer 29

Energy transferred = charge * pd

Question 30

Current and power equation

Answer 30

Power = pd * current

Question 31

National grid definition

Answer 31

A giant system of cells and transformers that covers the uk and connects to power stations. Transfers electrical power

Question 32

Step-up transformer

Answer 32

Increases pd and decreases current

Question 33

Step-down transformer

Answer 33

Decreases pd and increases current

Question 34

Static electricity

Answer 34

Caused by friction when insulting materials are rubbed together

Question 35

Power and resistance equation

Answer 35

P=I2R

Question 36

Power and voltage equation

Answer 36

P=v2/R

Question 37

Ohmic material

Answer 37

A material in which the current flowing through a resistor at a constant temperature is directly proportional to the voltage across the resistor.

Question 38

What is the relationship between potential difference and current for an ohmic conductor at a constant temperature?

Answer 38

Current is directly proportional to potential difference

Question 39

Resistance definition

Answer 39

anything that hinders the flow, of electrons

Question 40

What is a power rating

Answer 40

The maximum amount of safe power they can operate at

Question 41

Fuse

Answer 41

Will stop device from working by melting it if it goes over the maximum power rating

Question 42

Diode

Answer 42

allows current to flow easily in one direction, but severely restricts current from flowing in the opposite direction.