# GCSE Physics - 11.4

• ## Last lesson!

• ### Classwork

• We had our last lesson.
• Well done for solving the puzzle.
• ### Homework

• Revise for your exams!
• Enjoy the summer.
• ## More past papers

• ### Classwork

• I gave out the Paper 2s from Jan 2014 and June 2014 and their markschemes.
• We went through motors and generators.
• ### Homework

• Continue your revision.
• ## Past Paper Practice

• ### Classwork

• I gave you feedback on common errors on the paper you did last lesson.
• We started this paper (with Q4 taken out).
• ### Homework

• Mark the paper we did in the lesson using the markscheme I gave you.
• ## Past Paper Practice

• ### Classwork

• We did this past paper.
• ### Homework

• Mark the paper we did in the lesson using the markscheme I gave you.
• ## Proportionality

• ### Classwork

• We did a past paper question (Q5 c from this paper).
• We did some work on identifying proportion and inverse proportion using this sheet.
• They do sometimes ask questions about this - see Q1 c ii from this paper.
• ### Homework

• Have a good Easter.
• Revise!
• ## Circuits Recap

• ### Classwork

• We did some recap on symbols for quantities and units and key formulae.
• We did Q1-4 on P174 and went through the answers.
• I gave out some past papers - use the links above to see which questions to skip and to find markschemes.
• ### Homework

• Watch this video about AQA key terms and bring any questions you have to next lesson.
• ## Eye questions

• ### Classwork

• We went through the HW in detail.
• We made notes on laser eye surgery and the comparison between the eye and the camera.
• We started the questions on P118 and went through a few on the board.
• ### Homework

• Watch this video about the eye and the camera.
• ## The eye

• ### Classwork

• We made notes on the eye, sight defects and their correction, and demonstrated sight defects with a model eye.
• We made notes on lens power and the factors which affect it, and did some calculations.
• ### Homework

• Answer Q1-3 on P117 and hand in before registration tomorrow.
• If you want to know more about Fresnel lenses watch this video and for a bit of fun watch this video. OBVIOUSLY DO NOT GO AND BUY A HUGE FRESNEL LENS AND TRY ANY OF THIS STUFF AT HOME.
• ## The Lens Formula

• ### Classwork

• We went through the ray diagrams you did for HW, and checked them with a real lens.
• We made notes on the lens formula and did some examples.
• We answererd the questions on P113.
• ### Homework

• Read P114-5 and make notes.
• This video may help.
• Bring your notes to next lesson.
• ## Lenses and images

• ### Classwork

• We made notes on the features of images (magnified/diminished, upright/inverted, real/virtual).
• We experimented with forming images with a converging lens.
• We drew ray diagrams for a converging lens.
• ### Homework

• Draw three more ray diagrams for converging lenses when the object is:
• between F and 2F
• exactly at F
• closer than F
• This video may help.
• Bring your diagrams to next lesson.
• ## Refraction questions

• ### Classwork

• We went through the HW.
• We did Q5-6 on P106 and went through these.
• We didcussed optical fibres and fibre bundles.
• We started doing this task - we will go though it next lesson.
• ### Homework

• Watch the first 6 minutes of this video about lenses and make notes, using P108-9 to help you.
• Bring your notes to next lesson.
• ## Total internal reflection

• ### Classwork

• We did this starter activity about refraction.
• We did a practical activity to measure the refractive index of a perspex block.
• We made some notes on total internal reflection and the formula for the critical angle.
• We did a short practical to see total internal reflection in a semicircular block.
• ### Homework

• Answer Q1-2 on P105.
• Hand in tomorrow morning.
• Watch this video about optical fibres.
• ## Refractive index and Snell's Law

• ### Classwork

• We went through the HW and looked at the best way to draw ray diagrams for mirror images.
• We defined refractive index and did some examples, including Q1 and 2 on P103.
• We looked at Snell's law of refraction and did some example calculations.
• We modified Snell's law to cope with situations where light travels from a substance into air.
• ### Homework

• Answer Q3 on P103 and Q3 on P106.
• Hand in on Monday morning.
• ## Switch Mode Transformers

• ### Classwork

• We did some Qs on transformers (Q6-7 P208).
• We made some notes on switch mode transformers (see P205).
• We did some recap on reflection and refraction of light.
• ### Homework

• Answer Q1-3 on P99 and hand in tomorrow morning before reg.
• ## Transformers

• We did some more demonstrations similar to those in the video for the HW.
• We added a small amount to your notes on transformers.
• You assembed a transformer and investigated the effect of different numbers of turns of wire on the primary and secondary coils.
• ### Homework

• Answer Q1-2 on P207.
• Hand in tomorrow morning.
• Note: I will post links to past papers etc later today or tomorrow.
• ## AC generator, DC generator

• ### Classwork

• We made notes on AC and DC generators, and how the voltage can be increased.
• ### Homework

• Read P204-5 of the textbook and watch this video.
• Make notes on these and bring to next lesson.
• ## Generating a voltage in a coil

• ### Classwork

• We went through the homework questions in detail.
• We added to our notes on coils - particularly that the current induced in a coil opposes the motion of the magnet inducuing the current.
• We started doing these questions.
• ### Homework

• Finish the sheet we started in class - don't spend too long on it.
• Watch this video about AC generators, and optionally read P202-3.
• There is no need to make notes on these, but I want you to familiarize yourself with the ideas so that we can make good progress next lesson.
• ## Generator Effect

• ### Classwork

• We made some notes on the generator effect and watched a few demonstrations.
• You experimented with a magnet, a coil of wire, and a sensitive ammeter.
• We started to consider in detail the voltage induced in a coil by a moving magnet - more on this next lesson.
• ### Homework

• Answer Q1-2 on P201 and bring to next lesson.
• ## The electric motor

• ### Classwork

• We wenth through the HW.
• We took a close-up look at a DC motor, and how the commutator allows it to rotate continuously. We made some very brief notes - see P199.
• If you missed the lesson I recommend you watch the first part of this video (until he gets to multiple coils) and read the bit on P199 about the electric motor.
• We assebled and tested DC motors - most people got theirs working well.
• ### Homework

• Answer Q1a, Q2a and Q3 on P208. Hand in tomorrow morning.
• Please only these parts, and make sure your answers are complete.
• ## The motor effect

• ### Classwork

• We watched some demonstrations and made some notes on the motor effect and Fleming's Left Hand Rule.
• We started some questions on the motor effect.
• ### Homework

• Finish the sheet and hand in tomorrow morning before registration. PLEASE PUT YOUR NAME ON IT.
• Here is a video that might help you.
• ## Electromagnets

• ### Classwork

• We finished going through the mock and made some notes on electromagnets.
• Note: I just found this video which explains the polarity of electromagnets if you missed the lesson.
• ### Homework

• Finish all the questions on P195 and hand in tomorrow morning.
• ## Past paper questions

• ### Classwork

• I gave out some more past paper questions - these are from specimen paper 1 here.
• The markscheme for specimen paper 1 is here.
• ### Homework

• Continue your revision for the mock - you can use any of the past papers on the AQA website.
• ## Circuits Questions

• ### Classwork

• We went through the homework, and did some more calculations of voltage, current, resistance and power.
• ### Homework

• Start doing some revision, and think about which topics you want to revise before the mock.
• The mock will NOT COVER:
• Chapter 11: Lenses and the Eye
• Chapter 18: Motors, Generators, Transformers
• ## Investigating Effifiency

• ### Classwork

• We did some recap questions on specific heat capacity (see P128-9 of the textbook).
• We measured the efficiency of a 12V incandescent bulb, and evaluated the result (it turned out to be an overestimate as we did not take into account heat lost to the beaker and surroundings).
• ### Homework

• Answer Q5+6 on P192 and hand in tomorrow morning before registration.
• ## National Grid

• ### Classwork

• We did quite a few calculations about cost of electricity, and talked about standby power.
• We made notes on the key features of the national grid. See also this video.
• ### Homework

• Answer Q2-3 on P191 and Q4 on P192. Hand in on Monday.
• ## Cover Lesson

• ### Classwork

• Read P182-3 and make notes on how to choose the correct fuse. Answer Q1 and Q2 on P183.
• Read and make brief notes on calculating the cost of electricity on P187. I will post a video about this to watch for homework. Answer Q2 and Q3 on P187. It is essential that you enter the power in kW, and the time in hours into the formula, not in W and seconds as you would with most formulae.
• Read and make notes on the "New bulbs for old" part of P188-9. See if you can fill out the "Lighting Choices" worksheet.
• ### Homework

• Watch this video about calculating the cost of electricity and add to your notes from the lesson if necessary.
• Check the answers to the textbook questions here.
• Check the answers to the lighting choices worksheet here.
• ## Brain Lecture

• ### Classwork

• There was no lesson due to the science week lecture.
• ## Household Electricity: Safety

• ### Classwork

• We made notes on fuses and circuit breakers and saw a demonstration of a fuse blowing.
• ### Homework

• Please correct your oscilloscope sheet using the answers provided below. Here are some more questions that you can practise with if you need them.
• Watch and make notes on this video about earthing. Read P180-181 and add to your notes - particularly about the fuse protecting the live wire. We will go over this lesson and also look at RCCBs (which are mentioned on P181).
• Look around your house and record the power rating of five different appliances (you will often find the power rating on a sticker on the back) - e.g. hoover, kettle, microwave, tv, radio, hairdryer, phone charger, ... Bring the list to next lesson so we can use it.
• ## Using an oscilloscope

• ### Classwork

• We practised using an oscilloscope to measure the amplitude, period and frequency of an AC voltage.
• ### Homework

• If you were not here in the lesson, then please mark your answers to the "Reading Off Oscilloscopes" sheet. If you do not get something close to my answer, try to correct. Watch the video again if necessary.
• My answers were:
1. amplitude 0.3V, period=0.22s, frequency=4.5Hz
2. amplitude=0.027V, period 46ms or 0.046s, frequency 21Hz (remember you need to convert period to seconds when you use it in f=1/T)
3. amplitude=0.86V, period=5.6s, frequency=0.18Hz
• For all of you: Watch this video about mains cables and plugs, and read P178-9 of the textbook.
• Make notes on both of these and bring your notes to next lesson.
• ## Cover Work

• ### Classwork

• I am not here today. Here's your work.
• 1. Use the markscheme provided to mark and then if necessary correct your homework from last lesson.
• 2. Read and make notes on P178-9, and answer Q1-4 on P179. When you get home you can watch this video which will help.
• 3. You have watched a video about oscilloscopes but this might be a bit hard - do your best. Read the oscilloscope instruction sheet then have a go at the questions on the Reading Off Oscilloscopes sheet. If you don't have a clue what you're doing then wait till next lesson.
• ### Homework

• Watch this video which should help with the stuff you did in the cover lesson today. Add to your notes if necessary.
• ## AC, DC and Oscilloscopes

• ### Classwork

• We did some basic questions about circuits.
• I introduced Alternating Current (AC) and Direct Current (DC) - see the first few minutes of this video and P176-7 of the textbook.
• We used circuit building software to model an AC circuit, and then used an oscilloscope to see the voltage in a real AC circuit.
• We started the questions on P177.
• ### Homework

• Watch this video about AC and oscilloscpes - you will be using them next lesson.
• Answer Q1-4 on P177 and bring to next lesson.
• ## Circuits Recap

• ### Classwork

• We defined voltage and current (which you have done before in Y9).
• We did some recap questions on P185 (we will go through Q3 next lesson). These involved the formulae:
• Q = I x t
• E = V x Q
• V = I x R
• ### Homework

• Recap on rules about voltage and current in series and parallel circuits by wathcing these videos. Make notes where necessary - you have covered all of this in Y9 but you may have forgotten some of it. Be ready for a quiz next lesson.
• ## Test

• ### Classwork

• We did the end of topic test, and did some recap work on electrical circuits.
• ### Homework

• No homework.
• ## Topic Recap

• ### Classwork

• We did some recap questions on levers and hydraulics.
• We used a hydraulic system made from two syringes and calculated how much it would multiply the input force.
• ### Homework

• Revise for test tomorrow.
• ## Past Paper Questions

• ### Classwork

• We completed these past paper questions.
• The markscheme is here.
• We played a quick game of bingo which was won by SBM.
• ### Homework

• Continue your revision.
• ## Hydraulics and Levers

• ### Classwork

• We did the hard hydraulilcs and levers question that was given out last lesson. We will go through the last few parts next lesson.
• I gave out some past paper questions to practise before the test - we will start these next lesson.
• ### Homework

• Revise for test next Thursday.
• ## Hydraulic Systems Continued

• ### Classwork

• We went through the second half of the worksheet from last lesson.
• We discussed force multipliers and using ratios to solve problems.
• We started a difficult question about combined lever and hydraulic systems.
• ### Homework

• There is no homework, but if you need some extra help try this video and this video. BBC Bitesize also has a few good pages on hydraulics.
• ## Hydraulic Systems

• ### Classwork

• We looked at your graphs from the HW and thought about the expected shape of the graphs, and also discussed what it means for two things to be proportional.
• We did some questions about pressure and hydraulic systems and went through the first page.
• We looked at this problem involving hydraulics and levers. We will go through the elegant solution next lesson.
• ### Homework

• Watch and make notes on this video.
• Check your answers to the Hydraulic Systems page from the classwork and amend if necessary. Bring them to tomorrow's lesson to go through.
• ## Investigating circular motion

• ### Classwork

• We did some circular motion past paper questions.
• We did an experiment to investigate factors affecting the centripetal force on a rubber bung on a string.
• ### Homework

• Plot a graph of your results, hand in Monday before registration.
• ## Circular Motion

• ### Classwork

• We went through the homework on moments and stability.
• We started circular motion with a few examples, and thought about the velocity, acceleration and resultant force on an object moving in a cricle.
• ### Homework

• Watch this video about circular motion and add to your notes from the lesson.
• In particular make notes on the factors that affect the centripetal force, and how they affect it.
• As he says, you don't need to know the formula F=mv2/r for GCSE, but it doesn't hurt for you to see it.