Transcript What is the frequency of mains electricity?

Additional Physics – Forces
Exam Date -
Electricity
in your
home
L/O :- To understand mains electricity
Quick quiz
• What is the equation for work done?
• How does current behave in a parallel circuit?
• What is an LDR and how does light intensity affect the
resistance?
• What is charge measured in?
• How can you work out resistance?
• What affects the resistance in a circuit?
• How does voltage behave in a parallel circuit?
• How can you work out power and what is it measured in?
• How does current behave in a series circuit?
• What is the equation for working out current?
• How does voltage behave in a series circuit?
http://www.youtube.com/watch?v=SL6
C8Yz_bgs
Watch the demo from your
teacher and then answer
these questions
a)
b)
c)
d)
e)
What is the difference between A.C. and D.C.
current?
Where would you find A.C. current?
Where would you find D.C. current?
What is the frequency of mains electricity?
What is the voltage of mains electricity?
Wiring a plug
1. Earth wire
4. Live wire
5. Fuse
2. Neutral wire
6. Cable grip
3. Insulation
The neutral wire of a plug stays at
a potential close to zero relative
to 09/04/2016
the Earth
The live wire of a plug alternates
between positive and negative
potential relative to the Earth
What is wrong with the wiring of these plugs?
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What is wrong with the wiring of these plugs?
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What is wrong with the wiring of these plugs?
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What is wrong with the wiring of these plugs?
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Earth wires
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Earth wires are always used if an appliance has a _____
Metal
Fault in the appliance, causing the live
case. If there is a _____
Touch the case, the current “_______”
surges
wire to ______
down the
Fuse blows.
earth wire and the ______
Words
– fuse,
fault, the
metal,
surges, touch
The
earth
wire allows
electricity
a quick
path to the ground
What have you learnt?
• Do you know what the frequency of mains
electricity is?
• Do you know what the voltage of mains
electricity is?
• Could you label a plug?
• Can you recognise when a plug is
incorrectly wired?