Physics 2 Electricity

C/WControlling Circuits30-Nov-15 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.

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

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!

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!

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!

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

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

C/WCurrent30-Nov-15 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!)

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

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

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 …)

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

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

C/WCells / Batteries30-Nov-15 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? BlubAll real ‘p’ Cute RNR I cut IRC Team, erm?

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.

Demo Everyone’s a volunteer …

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?

Answer questions – 5 mins 1. What are you going to measure each time? 2. What are you going to change between measurements? 3. What must you keep the same to make it a fair test? 4. How can you make sure you get good results?

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

Plenary – Conclusion – 5 mins Write a conclusion for your experiment

Homework Revise for test

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