© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered.

Slides:

Advertisements

Similar presentations

P2.4 Central heating model © Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document.

Advertisements

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

Access 2 Physics A new course for 2007!. Access 2 Physics Energy Electricity Light, Colour and Sound Forces Magnetism Earth and Space.

Introduction to energy Energy is everywhere. We use energy to run in the playground, to bake a cake, and to read a book. We use energy for everything.

Electrical Energy Use in the Home

Bell Ringer What is kinetic energy? 2.What is potential energy? 3.What SI unit measures energy? 4.Do you think energy can be lost during a transfer.

Connect the appliance to the power rating using an arrow! Appliance Kettle Iron Television Hair dryer Power rating (W) 1100W 65W 1800W 2000W.

LAST SECTION OF CHAPTER 12 AND OF THE ENTIRE ELECTRICITY UNIT Reducing Our Electrical Energy Consumption.

Electrical Devices 20 April, April, 2017 Objectives

Learning Outcomes Distinguish between Power and Energy. And use the equation Energy = Power x Time Use the equations: Units Used (kWh) = Power (kW) x Time.

What Is Electricity? Electricity is a type of energy that can build up in one place or flow from one place to another. When electricity gathers in one.

Microwave Power input 120 VAC, 60 Hz 12.5 A, 1.5 kW MODEL NO WX SERIAL NO WARNING To reduce risk of fire of electric shock, do not remove.

The Inside Scoop of the Toaster Oven Alexa Fox and George Bonnewell.

Twenty Questions Electronics. Twenty Questions

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

$100 $300 $500 $200 $100 $500 $300 $500 $100 $500 $200 $400 $100 $400 $200 $500 $100 $400 $200 $300 $200 $400 HeatElectricityPotpourriEnergyCircuits.

Kay’s Sweet Cakes By: Samantha Gray. Reducing Carbon Footprints Turn off all of the equipment used for baking Find energy efficient ovens Limiting the.

Electrical energy. Summary questions a)Electrical energy is energy transfer by an electric ______________. b)Uses of electrical devices include: heating.

Electric Power. Answer Me!!! How is the brightness of a light bulb measured? What do you think is the significance of this?

Types of Energy.

TEK 5.6 (B) Demonstrate that the flow of electricity in circuit s requires a complete path through which an electric current can pass and can produce.

Switch On To Turning Off Jayden and Alexandra, Eco reps Class 5.1.

Mechanical, Sound, Light, Heat, & Electrical

How much do you know about ENERGY! What is the definition of energy? The ability to do work or cause changes in matter.

Using Energy Wisely Section Your Hydro (Energy) Bill.

CIRCUITS AND. Standards SPI Identify how simple circuits are associated with the transfer of electrical energy when heat, light, sound, and chemical.

19.1 Electrical power  In some electrical appliances, electricity can be easily converted into other forms of energy. heat energy light energy kinetic.

Core Technologies 3d. Core Technologies What is it that you need to know about the Core Technologies? Obviously, a person could spend a lifetime studying.

By becoming energy aware at home and at school you can save lots of money.  The first step to saving energy is knowing how much you use in the first.

1 1.2 Heat and internal energy Hand warmer and cooling belt Heat Internal energy Power Check-point 2 1.2Heat and internal energy ?

Science 7 – Unit C: Heat and Temperature Topic 6: Transferring Energy.

9I Energy and electricity

Bell work 11/5 Which type of heat transfer is occurring at points X, Y, and Z? (Copy and label the picture.)

Energy and Electricity

9I Energy and electricity

Electricity 6.P.3A.3 Construct explanations for how energy is conserved as it is transferred and transformed in electrical circuits.

Efficiency Hair dryer TV Lamp Toy Radio Heater Answer

The Cost of Electricity

Conservation of Energy

Electricity 6.P.3A.3 Construct explanations for how energy is conserved as it is transferred and transformed in electrical circuits.

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

Using Electrical Formulae

Energy Transfer Diagrams

Energy Conversions Unit 9-2

Natural Sciences and Technology Grade 6

Power Point Notes: Electrical Circuits

9I Energy and electricity

Power of Electrical Appliances

Thinking skills Switches and current

Electricity Calculations:

Energy Conversions Unit 9-2

Catalyst (5 minutes) A blow dryer. A desk lamp. A microwave. An Xbox 360. What do all of these have in common? (*hint: think about what we’re talking.

Energy Conversions Energy Conversion What does a Bunsen burner,

Energy Conversions Energy Conversion What does a Bunsen burner,

A B C D E F G Energy rating NViz Music Power 4 Sankey SS1 Television

Natural Sciences Grade 7

Question 1 – What does energy efficiency measure?

Different Forms of Energy

Reducing Electrical Energy Consumption

Types of energy & Energy Transformation

The heating effect of an electric current

Equipment This lesson has a small focus on a new equation, other than that it is a small recap and equation practice. Calculators A r.

Presentation transcript:

© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. P1 3.1 – Questions and answers 1What energy transfers are the following devices designed to bring about? (a) electric drill AElectric to kinetic (b) fan heater AElectric to kinetic and heat (c) television. A Electric to light and sound.

© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. P1 3.1 – Questions and answers 2How is energy wasted in the devices in question 1? A(a) Heat and sound. (b) Sound. (c) Heat.

© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. P1 3.1 – Questions and answers 3Name two electrical devices (other than those in question 1) that are designed to transfer electrical energy into: (a) heating AAny two from: cooker, toaster, microwave, electric fire, hair dryer, iron, etc. (b) light AAny two from: light bulb, LED, computer, etc.

© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. P1 3.1 – Questions and answers 3(c) sound AAny two from: radio, computer, stereo system, MP3 player, etc. (d) movement. AAny two from: food mixer, hair dryer, lawnmower, electric saw (or other DIY tools), etc.; do not accept television (some students think the ‘moving’ picture means that kinetic energy is involved) unless electrons in CRT are specified.

© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. P1 3.1 – Questions and answers 4A 50 W radio is switched on for 3 hours. How much energy does it use? AEnergy = power × time = 50 W × (3 × 3600) s = J (or 540 kJ).

© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. P1 3.1 – Questions and answers 5 A tumble dryer uses 2700 kJ of electrical energy when it is used for half an hour. What power is the tumble dryer? A Power = energy/time = J/(30 × 60) s = 1500 W (or 1.5 kW).

© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. P1 3.1 – Questions and answers 6A computer uses 2400 kJ of energy. Its power is 65 W. How long was it switched on for? Give your answer in hours, minutes and seconds to the nearest second. ATime = energy/power = J/65 W = seconds. This is hours = 10 hours minutes = 10 h 15 m 23 s.

© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. P1 3.1 – Questions and answers 7An electric oven has a power of 3 kW. A cake takes 40 minutes to bake. (a) What is the maximum amount of energy the oven will use to bake the cake? AEnergy = power × time = 3000 W × (40 × 60) s = J (or 7200 kJ).

© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. P1 3.1 – Questions and answers 7(b) Explain why this is a maximum amount. (Hint: think about what the thermostat in an oven does.) AThe oven takes some time to warm up, so some energy will have been used before the cake is put in. Once the oven has reached the correct temperature the heating element is switched off until the temperature drops a little, so the oven is not using electricity for all the time it is switched on.

© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. P1 3.1 – Questions and answers 8 ‘The increasing ownership of toasters could help to reduce the amount of electricity used.’ Explain this statement. (Hint: think about how you would make toast if you did not have a toaster.)

© Pearson Education Ltd Copying permitted for purchasing institution only. This material is not copyright free. This document may have been altered from the original. P1 3.1 – Questions and answers A A toaster has the heating elements very close to the bread, so not much energy is wasted. A grill is usually further away from the bread, and has a much larger heating element and so is likely to have a higher power. Unless a lot of toast is being made some of the element will just be heating air and so wasting energy. So, although some electricity will have been used when the toaster was made, taking into account the savings in electricity use when a toaster is used instead of a grill, owning a toaster might save on electricity use overall.