P5 Mains – Use Physics Textbook Pages 64 - 73

Mains Supply Power equations Label the diagram the plug State and describe the type of current supplied by the mains Write the equation relating energy, electricity? charge and potential difference.

State and describe type of current supplied by batteries?

Write the equation relating power, State the mains and . current and voltage.

Write the equation relating power, current and resistance. Explain why you would get an electric shock by touching the live wire in a plug

Power What is the equation that relates power, energy and time? Explain why each of the following materials are used in the plug:

Copper What is meant by a power rating on electrical appliances?

brass Why might it be bad to have a high power rating? Plastic 2000J of energy is transferred over 3 seconds, what is the power? When are two-core cables used? 14000 W of power is used on a device over a period of 2 hours. How much energy is transferred? Why are the cables different thicknesses? P5 Mains electricity – Use Physics Textbook Pages 64 - 73

A 5 kW leaf blower is connected to the mains supply. Calculate the current flowing through the leaf blower.

A 900 W microwave is cooking some chicken, 340000 J of energy is needed to cook the chicken. How much time will it be in the microwave.

Label each part of the National Grid

Explain what happens to a wire if a high current is passed through it. Describe the role of a Step – up Describe the role of a Step – . down Transformer.

How do we reduce energy loss in overhead cables. Where are step up Where are step - down found? transformers found?