Diagnosis Test: Edexcel Generating Electricity and Energy P1.5 P1.6 (15 Marks)

SOLUTIONS

Diagnosis test: Edexcel Generating Electricity and Energy P1.5 P1.6 (15 marks)

a. The main energy transfer in a petrol engine car is: (circle the correct answer)

a.A. Chemical strain electric

a.B. Heat sound kinetic

a.C. Chemical heat kinetic

a.D. Electric chemical heat

(1 mark)

b The equipment opposite can be used to generate an electric current.

Draw a line from each action to show what will happen.

The first one has been done for you.

http://www.bristolwatch.com/ele/img/mag22.gif

Action

Push North end of the magnet Produces a direct current into the coil

Pull the North end of the magnet Needle does not move out of the coil

Push the South end of the magnet Needle flicks to the left into the coil

Hold the magnet still in the coil Needle moves to right

(2 mark) www.pixl.org.uk The PiXL Club Ltd, Company number 07321607 2. Transformers are used to step-up the voltage produced by a generator before it is distributed around the country. Explain why the voltage has to be stepped up.

 stepping voltage up reduces current

 less current results in cables not being as hot

 less energy will be lost to the environment

 so less money will be wasted

(3 marks)

3. An electrical tumble drier is rated at 3kW. It is used for 12 hours in a week.

If electricity costs £0.15 per kWh, what is the cost of using the drier for a week?

Energy per week = 3kW x 12 Hours = 36kWh

36kWh x £0.15 =

Cost of using the drier for a week = £5.40

(3 marks)

QWC Suggested marking guidance (Total 6 marks) Marks awarded for this answer will be determined by the Quality of Written Communication (QWC) as well as the standard of the scientific response. Teachers should and apply a ‘best-fit’ approach to the marking. 0 marks Level 1 (1-2 marks) Level 2 (3-4 marks) Level 3 (5-6 marks) No relevant Attempt at a description 1-2 Brief description 3-4 marking points. Clear description almost all marking content. marking points. There is reasonable accuracy in points. The spelling, punctuation and spelling, punctuation and grammar, The answer shows almost faultless grammar are very weak. although there may still be some spelling, punctuation and grammar. errors

4. QWC: Describe the main stages in generating electrical energy from coal in a power station. Solutions  Coal is burnt to release heat energy

 Heat is used to produce steam

 Steam spins a turbine

 Turbine turns the generator

 And the coil of wire and the magnets move past each ther

 Generator produces electricity

(6 marks)