Electricity

Question 1

what is current and what is it measured in

Answer 1

measure of flow of electrons around a circuit AMPS (A)

Question 2

What is potential diffrence/ voltage

Answer 2

driving force of the flow of electrons( current)
measured in VOLTS

Question 3

what is resistance

Answer 3

Everything that resists or opposes flow of electrons in OHMS

Question 4

which way does current flow

Answer 4

From the positive terminal to the negative terminal
(right to left)

Question 5

what is ohms law equation!!!

Answer 5

V= IR
VOLTAGE = CURRENT X RESISTENCE

Question 6

what does the ohms law show about relationship between current and voltage

Answer 6

as long as resistance remains constant, if we increase voltage then the current will increase proportionally

Question 7

is voltage directly proportional to current

Answer 7

YES
DIAGONAL STRAIGHT LINE

Question 8

what are we assuming in ohms law

Answer 8

that temp stays constant

Question 9

what is a series circuit

Answer 9

one loop

Question 10

what happens if one component of a series circuit stops working

Answer 10

the whole circuit stops working

Question 11

how do you work out voltage in series

Answer 11

It’s shared equally to all components
V1 + V2 + V3 = V total

Question 12

how do you work out current

Answer 12

same through all components
can also rearrange ohms law to calculate current

Question 13

how do you work out resistence in series

Answer 13

total resistence = sum of all individual resistence

Question 14

what is the equation for charge flow

Answer 14

Charge flow = current x time

Question 15

what is charge flow measured in

Answer 15

Coloumbs (C)

Question 16

what is parralell circuit

Answer 16

has more than one loop

Question 17

what happens if one component breaks in a parralell circuit

Answer 17

it stays intact

Question 18

how do you work out voltage in parralell

Answer 18

same through all components

Question 19

how do you work out current in parralell

Answer 19

shared through all loops
I1 + I2 + I3 = I total

Question 20

What will loops have if they have a greater resistance

Answer 20

A lower share of the current

Question 21

what is mains electricity

Answer 21

refers to the power that is brought to peoples homes
230 V
50 Hz

Question 22

What does AC stand for and does it have Alternating direction

Answer 22

Stands for Alternating current
Yes

Question 23

What does DC stand for and does it have one direction

Answer 23

Direct current
YEA

Question 24

what are the three wires in a plug

Answer 24

Live - brown
neutral - blue
green - earth

Question 25

what does the fuse do

Answer 25

melts if the current is too high

Question 26

when is the demand for energy the highest and why

Answer 26

Late afternoon as people are coming home from work and shchool

Question 27

what does the step up transformer do

Answer 27

Increases voltage

Question 28

What do step down transformers do

Answer 28

Decrease voltage to a safe level

Question 29

What is the route of the national grid

Answer 29

Power stations —-> step up transformer —-> transmission cables —-> step down transformer ——> homes

Question 30

why do we need a low current

Answer 30

Reduce heat energy being lost by surroundings It’s dangerous And can Burst appliances

Question 31

what level volts are transferred to your home

Answer 31

230 V

Question 32

what is static electricity

Answer 32

build up of charge on insulating materials

Question 33

do all materials contain charge

Answer 33

yes mostly neutral as protons and electrons cancel

Question 34

what happens when materials are rubbed against each other

Answer 34

causes friction which moves electrons from one object to be transferred to another

Question 35

does charge build up in conducting material

Answer 35

no so static electricity can’t happen

Question 36

What happens when you rub a polythene rod to a cloth

Answer 36

The rod gains electrons and becomes a negative static charge The cloth loses electrons and becomes a positive static charge Friction created electrons transferred from cloth to rod

Question 37

In static electricity do you talk about the transfer of protons or electrons

Answer 37

Electrons

Question 38

What happens when size of charge increases

Answer 38

Potential diffrence builds up between material and earth

Question 39

which plug, live neutral(blue) or earth wire is in the middle

Answer 39

EARTH (YELLOW AND GREEN)

Question 40

WHAT IS RHE POTENTAIL DIDFENRCE BETWEEN NEUTRAL WIRE AND EARTH WIRE

Answer 40

0