Unit 4- Mains Electricity Flashcards
(32 cards)
What does the brown wire do
Delivers the energy to the thing it is powering
What does the blue wire do
The blue wire takes the electrons away with no energy
What does the earth wire do
99.9% of the time it is pointless. But that 0.1% of the time it is used when the power station sends to much energy and the yellow and green wire takes the energy in the ground and absorbs it. The earth wire is just a safety feather
What is the danger of spilt drink on heater
It is an electrical conductor, it will start a fire or electrocute you (connects the person to the electricity)
What is the danger of lots of plugs in a sockets
Overheats which leads to fire (overload)
What is the danger of pulled wire
Could damage the connection inside the wire
What is the danger of frayed cable
You are exposing the wire, you could get electrocuted
What is the danger of pushing metal objects into electrical socket
You could get electrocuted
What is the danger of long cable
It is a trip hazard
High energy transfer=
High power
What does current cause
Heat in the wires and components
What is needed when heat is produced
More voltage is needed to transfer energy to the components
Power (P) =
Current (I) ❌ voltage (V)
What is power measured in
Watts
What is current measures in
Amps
What is voltage measured in
Volts
Energy (E) =
Power (P) ❌ Time (T) or current (I) ❌ voltage (V) ❌ time (T)
What is energy measured in
Joules
What power measured in
Watts
What is time measured in
Seconds
What are the three different colour wires in a plug and what are they all called
Blue: neutral
Brown: live
Green/ yellow: Earth
What is the job of the fuse
Protects circuit from damage if current is high or if it has overheated
How does the fuse protect the circuit from damage
Thin fuse wire melts ➡️ break in the circuit
Can you reset the fuse
No, need to replace the fuse
