Circuits 2 (UK Mains Electricity) R Flashcards
In use,what does the live wire do
The live wire carries the alternating potential from the supply
In use what does the neutral wire do
The neutral wire completed the circuit
In use what does the earth wire do
The current will only flow in the earth wire if there is a fault connecting to a non 0 potential from the supply.
The earth wire is a safety wire which stops the exterior of an appliance from going live
Which wire can become dangerous if a switch in the circuit is open
The live wire
For an example of what could happen if a switch in the circuit is open,what would happen if a television is switched off but plugged In switched on at the wall
All it needs is a path for the electricity to flow through,this path could be provided by a damaged cable showing the live wire,if touched could cause an electric shock
Power is the rate at which _____is _______or work is done
1energy
2transferred
What is an energy transfer if 1J per second equivalent to
1W
In an energy transfer what is efficiency
Efficiency is the ratio of useful energy out to total energy in
What does an efficiency of 0.5 mean
It means half the energy is used but half is wasted
What does an efficiency of 0.75 mean
It means three quarters of the energy is useful but a quarter is wasted
How do you increase the efficiency of an energy transfer
The amount of wasted energy needs to be reduced
