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Physics 2

Physics 2. Electricity. C/W Controlling Circuits 16-Jul-14. Aims:- 4 know why a circuit doesn’t work 5 explain ‘series’ and ‘parallel’ 6 control all circuits using switches Starter – 5 minutes Imagine you have set-up a circuit and it doesn’t work.

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Physics 2

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  1. Physics 2 Electricity

  2. C/WControlling Circuits16-Jul-14 Aims:- 4 know why a circuit doesn’t work 5 explain ‘series’ and ‘parallel’ 6 control all circuits using switches • Starter – 5 minutes • Imagine you have set-up a circuit and it doesn’t work. • Write down as many reasons as you can to explain what might be the problem.

  3. Copy notes – 5 minutes • If a circuit doesn’t work it is because there is not a complete circuit • In a series circuit, if one thing breaks, everything stops • A switch near the battery controls everything • In a parallel circuit, a switch near the device controls it separately

  4. Practical – Set 1 – 40 minutes • Build the circuits on Sheet D • Draw the circuit diagram in your book • Describe the operation of the circuit • Highlight any important complete circuits on your drawing • Do not try your own experiments!

  5. Practical – Set 2 – 40 minutes • Look at Sheet C • Explain why each circuit won’t work • Look at Sheet E • What happens when bulbs or batteries are added to a circuit? • Build circuits on Sheet D • Try to explain how each works before going on to the next • Do not try your own experiments!

  6. Practical – Set 3 – 40 minutes • Draw Sheet C circuits in your book • For each one say why it will not work • Build the circuits on Sheet E • Complete these sentences:- • “The more batteries …” • “The more bulbs …” • Do not try your own experiments!

  7. Homework • Answer worksheet questions in books • Minimum: Set 3: Q’s 1 and 2 Set 2: Q’s 1, 2 and 3 Set 1: All Q’s • Future electricians: try all questions

  8. Are You On Target Today? Aims:- 4 know why a circuit doesn’t work 5 explain ‘series’ and ‘parallel’ 6 control all circuits using switches

  9. C/WCurrent16-Jul-14 Aims:- 4 describe and measure current 5 explain why current is not used up 6 explain current using a model • Starter – 5 minutes • Draw what you think you would see if you were so small you could look inside a wire in a circuit (when it’s working!)

  10. Copy notes – 5 minutes • Wires are full of particles • A battery makes the particles flow round together (like doing a conga) • The speed of the flow is called current • Current is measured in amps (A) • An ammeter measures current • The current is never used-up because the particles can’t be destroyed

  11. Practical – 30 minutes • Set-up the circuits on Sheets F and G • Advice: always set up circuits without meters first; then add the meters • In your book, copy the circuit and write down the current reading in each case

  12. Plenary – Conclusions – 10 mins • What four things did you find out from the experiment? (Hints: The more batteries …, The more bulbs …, The current in a series circuit …, The current in a parallel circuit …)

  13. Homework • Buy a fruit … • … seriously – next time you will need a fruit (or vegetable e.g. potato) to do the practical – no fruit, no practical

  14. Are You On Target Today? Aims:- 4 describe and measure current 5 explain why current is not used up 6 explain current using a model

  15. C/WCells / Batteries16-Jul-14 Aims:- 4 describe voltage & investigate a question 5 relate voltage to energy & make a fair test 6 explain voltage using a model & work precisely • Starter – 5 minutes • Which electricity words are these? Blub All real ‘p’ Cute RNR I cut IRC Team, erm?

  16. Copy notes – 5 minutes • A battery is a group of cells • A cell stores chemical energy • It turns into electrical energy in a circuit • The current carries the electrical energy as it flows round the circuit • The amount of energy the current gets depends on the battery voltage • The current ‘hands over’ the energy when it meets bulbs, motors etc.

  17. Demo Everyone’s a volunteer …

  18. Practical – investigating fruit cells • Investigating the voltage generated by the chemical energy in fruits • First choose and a write down a question to investigate: • Does the type of fruit matter? • Does the distance between electrodes matter? • Does the depth of electrodes matter?

  19. Answer questions – 5 mins • What are you going to measure each time? • What are you going to change between measurements? • What must you keep the same to make it a fair test? • How can you make sure you get good results?

  20. Practical – do it … Make a table for your results and then get started

  21. Plenary – Conclusion – 5 mins • Write a conclusion for your experiment

  22. Homework • Revise for test

  23. Are You On Target Today? Aims:- 4 describe voltage & investigate a question 5 relate voltage to energy & make a fair test 6 explain voltage using a model & work precisely

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