p2c power station 2
TRANSCRIPT
Electricity Transmission
Electricity Transmission
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National GridNational Grid
National GridNational Grid• Electricity is generated in ________
_________• It is transmitted around the
country by the ___________ _________
• The electricity is carried along _________ called transmission lines
• Electricity is generated in ________ _________
• It is transmitted around the country by the ___________ _________
• The electricity is carried along _________ called transmission lines
TransformersTransformers• Voltage in the
transmission lines is kept _____
• This means that the current is ____
• But energy lost through _______ is reduced
• Voltage in the transmission lines is kept _____
• This means that the current is ____
• But energy lost through _______ is reduced
TransformersTransformers
TransformersTransformers
Paying for ElectricityPaying for Electricity
• Electricity meters record the amount of electrical energy passing through them in
kilowatt-hours (kWh)
• Electricity meters record the amount of electrical energy passing through them in
kilowatt-hours (kWh)
Paying for ElectricityPaying for Electricity
Cost• You can calculate how much it
costs to run an electrical device using power:
Power = Current x Voltage
Cost• You can calculate how much it
costs to run an electrical device using power:
Power = Current x Voltage
Paying for ElectricityPaying for Electricity
…and energy supplied
Energy supplied = power x time
…and energy supplied
Energy supplied = power x time
Paying for ElectricityPaying for Electricity
e.g. A heater uses a current of 12 A and a voltage of 230 V.
1. What is its power?2. How much does it cost to run
it for 2 hours if one unit costs 8p?
e.g. A heater uses a current of 12 A and a voltage of 230 V.
1. What is its power?2. How much does it cost to run
it for 2 hours if one unit costs 8p?
Paying for ElectricityPaying for Electricity
e.g. A lamp uses a current of 5 A and a voltage of 20 V.
1. What is its power?2. How much does it cost to run
it for 1 hour if one unit costs 6p?
e.g. A lamp uses a current of 5 A and a voltage of 20 V.
1. What is its power?2. How much does it cost to run
it for 1 hour if one unit costs 6p?
Paying for ElectricityPaying for Electricity
e.g. A 690 W toaster draws a current of 3 A.
1. What voltage is it running off?2. How much does it cost to run
it for 2 hours if one unit costs 10p?
e.g. A 690 W toaster draws a current of 3 A.
1. What voltage is it running off?2. How much does it cost to run
it for 2 hours if one unit costs 10p?
Paying for ElectricityPaying for ElectricityQuestionsPage 49 - Qs c & dPage 71 - Qs 1, 2 & 4
QuestionsPage 49 - Qs c & dPage 71 - Qs 1, 2 & 4
ElectricityElectricity
PrepRead pages 47, 48 and 50 and use
the internet to write brief descriptions of biomass and nuclear power and draw up a table of advantages and disadvantages for each.
PrepRead pages 47, 48 and 50 and use
the internet to write brief descriptions of biomass and nuclear power and draw up a table of advantages and disadvantages for each.