Mains Electricity - exam practice
Mains Electricity
Question 1 of 6
This question is about mains electricity in the UK.
The UK mains supply is an A.C. supply.
Describe what an A.C. supply is.
In UK plugs, the live wire is
The neutral wire is
The Earth wire is
Which wire should the fuse be connected to?
A fridge has a power rating of 800 W.
Calculate the energy required to run the fridge for 1 day.
The fridge operates of the UK mains supply.
State the operating voltage and frequency of the UK mains supply.
Calculate the operating current of the fridge.
A homeowner needs to replace the heating element in their electric oven.
The table below summarises the details of 3 different heating elements.
Calculate the power of heating element B.
Give your answer to 3 significant figures.
The oven is turned on for 40 minutes.
Calculate how much extra energy heating element uses compared to heating element A.
Both heating elements A and B are capable of heating the oven.
Explain heating element should the homeowner install.
This question is about an electric hairdryer.
The hairdryer contains a heating element, an electric fan and a plastic case.
The hairdryer runs off the UK mains supply.
State the voltage and frequency of the UK mains supply.
The power of the hairdryer is 1.2 kW.
Explain what is meant by 1.2 kW.
Calculate the energy transferred in 10 minutes of operation.
This question is about a coffee machine.
The heating element of the coffee machine is rated at 1,500 W, 230 V.
Calculate the resistance of the heating element. Give your answer to 1 decimal place.
Calculate the current flowing through the heating element. Give your answer to 2 decimal places.
10 W is equivalent to
The UK Mains supply is