Electricity In The Home

Question 1

What way does alternating current go (ac)

Answer 1

It alternates from left to right

Question 2

When do we get AC

Answer 2

If we use an alternating potential difference (positive and negative)

Question 3

What’s the uks main supply

Answer 3

AC 50hz and 240V

Question 4

What are hertz (hz)

Answer 4

Amount of waves or frequency

Question 5

What is potential difference

Answer 5

A measure of energy per unit of charge between 2 points in a circuit

Question 6

What are all the equations for power

Answer 6

P=I^2(Current in A) x R (resistance in ohms)
P=I x V
P=V^2xR

Question 7

What is power and its unit

Answer 7

The rate at which an appliance is supplied with or supplies useful energy
Power in watts (W)

Question 8

What is charge

Answer 8

Positive or negative value carried by a particle

Question 9

What’s the formula for charge

Answer 9

Q(charge in coulombs C) =I (current in Amps) x T(s)

Question 10

What are resistors in a series

Answer 10

A series of resistors all with different values or the same in a circuit

Question 11

How do u calculate resitance from resistors in a series

Answer 11

Rt= R1+R2+R3….
Rt=total resistance

Question 12

What are resistors in parallel

Answer 12

Resistors on top of eachother
The resistance is always less than the smallest resistance in the system

Question 13

How do you calculate resistors in parallel

Answer 13

R1xR2xR3…/R1+R2+R3…

Question 14

What is direct current (DC)

Answer 14

Only flows one way

Question 15

What’s resistance

Answer 15

A force that counteracts the flow of current

Question 16

How is resistance calculated

Answer 16

R (in ohms) = v(volts)/I (current)

Question 17

What’s ohms law and the equation to go with it

Answer 17

Electric current through a conductor (between 2 points) is directly proportional to the voltage (across the 2 points)
V(Voltage)= I(current) x R(ohms)

Question 18

What are transformers

Answer 18

A system of 2 coils linked via an iron bar- it is able to step up or step down the voltage through electromagnetic induction

Question 19

What’s electromagnetic induction

Answer 19

Creation of EMF by way of moving a magnetic field around a conductor.

Question 20

What’s an Electromotive force and its formula

Answer 20

Electromotive force potential difference that tends to rise electric current
EMF= Wd(Work done in J) /Q (charge in coulombs C)

Question 21

How do you calculate a transformer

Answer 21

N(Number of coils) s(secondary)/Np(primary)=V(voltage)s/vp

Question 22

What are electrical costs

Answer 22

Electricity measured in Kw/h

Question 23

Equation for electrical costs

Answer 23

Cost=Power(kw) x Time(hour) x Price per kw

Question 24

What’s the difference between conductors and insulators in terms of free electrons

Answer 24

Conductors- many free electrons that move easily enabling current flow
Insulators - have few free electrons, restricting electrical flow

Question 25

Equation for energy

Answer 25

E=P/T

Question 26

How does short circuiting happen

Answer 26

When the current finds a way to bypass the appliance on a path that has little to no resistance

Question 27

What happens when something short circuits

Answer 27

It can cause circuit damage or explosions

Question 28

What colour and purpose does a live wire have

Answer 28

Brown (bRown to the Right)
Connects to fuse- dangerous wire-carries voltage

Question 29

What colour and purpose does an earth wire have

Answer 29

Green and yellow
Connects charge and appliance to the earth so there is a low resistance way back down

Question 30

What colour and purpose does a neutral wire have

Answer 30

bLue(to the Left)
Carries current in opposite direction

Question 31

What happens when u switch a switch

Answer 31

The switch shuts the circuit so if it is live

Question 32

What is a 2way switch

Answer 32

A switch that has 2 ways of getting turned off and on