Efficiency.

Slides:

Advertisements

Similar presentations

P1.3 The usefulness of electrical appliances

Advertisements

Efficiency To be able to calculate the efficiency of energy transfers Sunday, May 10, 2015.

Energy efficiency & Sankey diagrams

Energy saving. Which of these is the odd one out? Losing heat through a window Over boiling a kettle Leaving a mobile phone charger plugged in Standby.

Energy Transfer Sound energy Heat energy Chemical energyLight energy Gravitational potential energy Electrical energyKinetic energy Key wordPronunciationDefinition.

Wasted energy Not all energy is changed into the type we want.

Electrical Appliances and Power. Learning Objectives To be able to calculate power, and cost of electricity To be able to apply these calculations to.

Write down the energy transfers in the following:

Energy Transfer Diagrams Starter Activity (back of jotters): 1)What are the 10 types of energy? 2)Draw an energy flow diagram for an ipod.

ENERGY.  Energy is measured in Joules (J)  A joule is a small unit of energy NOT JEWELS like these -> JOULES.

Energy efficiency Some might: all must: most should :

Some might: Compare efficient and inefficient devices Some might: Compare efficient and inefficient devices ENERGY EFFICIENCY most should : Apply the conservation.

ENERGY. Energy  Energy is measured in Joules (J)  A joule is a small unit of energy NOT JEWELS like these -> JOULES.

Energy splat! Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy Watch this space!

Electrical power. What is electrical power? Electrical power is the rate at which an electrical appliance uses electrical energy. All appliances have.

Power and Efficiency. Power Power is defined as energy per unit time Electrical power describes the amount of electrical energy that is converted into.

P1 Physics Q2) Energy Transfer and Efficiency Nov 2015 exam revision.

Energy transfers. What is a useful energy transfer? Many household objects are designed to transfer energy from one form into another useful form. What.

Conservation of Energy

Sankey diagrams These provide a visual representation of energy transfers in a closed system. They are always drawn to scale.

Sankey diagrams These provide a visual representation of energy transfers in a closed system. They are always drawn to scale.

Energy transformations Monday, 31 July 2017

Efficiency Hair dryer TV Lamp Toy Radio Heater Answer

Conservation of Energy

Energy and Electricity

To understand energy efficiency and Sankey diagrams

Electric Power Energy Cost

All of the energy going into a device is either transferred or stored.

Do now! Can you write in your planners that the energy sheet you stuck in at the end of last lesson is for HOMEWORK due next Wednesday?

Energy Transfer Diagrams

Write your ideas in the first thought bubble!

KEY WORDS RENEWABLE ENERGY CONSERVED DISSIPATED USEFUL WASTED

Energy and Electricity

Energy Transfers 8 x £1 Coins Useful for the vending machine!

Conservation of Energy

Energy, Power & Climate Change

KS4 Physics Energy Transfers.

Energy efficiency Some might: all must: most should :

Conservation of Energy & Efficiency

Electricity Calculations:

Energy Cost Calculations

02/12/2018 Energy.

Grade 6 Science Unit 11 Energy

Bell task Unscramble the anagrams to work out the types of energy. Then name something that has this kind of energy. Answers Light Kinetic Chemical potential.

5 a day revision Energy and electricity What is efficiency?

Date 4:Energy Diagrams Lesson Outcomes How I did Targets

Energy and Electricity

Teacher’s Notes Energy Transfer Circus:- Burning Demo:- Fuel Demos:-

The heating effect of an electric current

Different Forms of Energy -Chapter 3

Power and electrical power

Energy Revision Define renewable energy.

Date 4:Energy Diagrams Lesson Outcomes How I did Targets

Power S Define electrical power as energy per unit time, and solve related problems. Include: P = E/t.

A force is applied – pushing the block

Can you finish the questions you started last lesson?

Energy and Electricity

Energy & Transformations

Presentation transcript:

Efficiency

(Watts = Joules per second) Which of these might be the most efficient? Be prepared to justify your answer! Slow cooker Kettle Electric hob Period of use? Energy in? (Watts = Joules per second) 180 W 2500 W 1500 W Useful and wasted energy out?

Sankey diagrams These can be used to show energy transfers, and the relative amounts of energy converted to each type of energy

Rank these devices in order of efficiency Draw Sankey diagrams to show the efficiency of the following electrical devices: Energy in Energy out Efficiency? Light bulb 60W Light 5W Heat 55W Slow cooker 180W Heat 170W Light 10W Mobile phone charger 1W 0.8W Electrical 0.2W Heat Electric hob 1500W Heat 1300W Light 150W Sound 50W Kettle 2500W Heat 2200W Sound 300W Rank these devices in order of efficiency

Plenary

Rank these in order (of efficiency) from your calculations Were your original guesses right or wrong? Why were they right/wrong? Slow cooker Kettle Electric hob