Agree Learning Outcomes: Topic: 7.2.2 – Energy analysis - electric current Spec link: P7.1b,c and d, P7.2b and c Time: 70 mins Recorded Assessment: Review: Check answer and deal with misconceptions. Present New Knowledge: TLD – explain the energy flow diagrams to students. Agree Learning Outcomes: What do electrical appliances do? How do appliances change the energy stores? How do we analyse systems where a current flows? Apply To Demonstrate: Analyse an electric kettle and answer questions. Construct Meaning: Discuss how appliances change the energy in stores. Students discuss and feed back.

Bell As you enter the room What can you tell me about this image? What conclusions can you draw from this image?

Energy analysis - electric current LO Energy analysis - electric current What do electrical appliances do? How do appliances change the energy stores? How do we analyse systems where a current flows?

What do electrical appliances do? NK What do electrical appliances do? Microwave oven: Hairdryer: Electrical appliances transfer energy between stores. Chemical energy at the power station Energy transferred electrically Energy transferred by heating Thermal energy store in food Chemical energy at the power station Energy transferred electrically Energy transferred by infrared radiation and mechanically Thermal energy store in surroundings and kinetic

How do appliances change energy stores? CM How do appliances change energy stores? Discuss and write down your thoughts for the covered parts below.

How do appliances change energy stores? CM How do appliances change energy stores? Discuss and write down your thoughts for the covered parts below.

How do appliances change energy stores? CM How do appliances change energy stores? Discuss and write down your thoughts for the covered parts below.

How do you analyse systems where a current flows? CM How do you analyse systems where a current flows? State one other thermal store that will be filled up as the kettle heats the water.

ATD Try some questions N.B. Table 2 for question 3 is on the previous slide.

Try some questions - continued ATD Try some questions - continued

ATD Review Chemical store at power plant electrically transferred to pickle. Pickle transfers to thermal store in surroundings. 333W (3 significant figures) Kinetic rather than chemical store. No heating (ignores friction). (a) Inclusion of transfer to the thermal store in surroundings. (b) 2p Energy cannot be created nor destroyed. Energy is not ‘saved’ rather it is not transferred between stores. Transferring energy costs money. Could read ‘saves the billpayer money’.

LO Learning questions What do electrical appliances do? How do appliances change the energy stores? How do we analyse systems where a current flows?