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Recap of Energy Production Hydroelectric Energy Generation Nuclear transport containers Pro’s and Con’s for wind (from London England) Doc Zone special
What are the impacts – environmental, human health, economic…?
% Efficiency Comparison of how much useful energy is converted in an energy transformation No energy transformation is 100% efficient, energy is lost in the form of heat, sound…
Units for Energy (E) Energy can be measured with many different units: Joules (J) kiloJoules (kJ) Calories (Cal) kiloWatt hours (kW∙h) Increase Unit Energy Size James Watt James Prescott Joule
Calculation % efficiency = energy out x 100% energy in % efficiency = E out x 100% E in NOTE: units for energy in and out must match
Sample Problem A light uses 230,000J of energy to produce 16,250J of light energy. What is the % efficiency?
Sample Problem 2 A refridgerator uses 450kWh of energy. If there is 497kWh of energy input to run the fridge how efficient is the refridgerator?
Energy efficient electronics are marked with the energy star symbol!
Power. Definition: The amount of energy converted to heat, light, sound or motion per unit of time Unit: Power is measured in watts (W) Naming: Named.
Power and Energy Calculations. Power Ratings Power is the rate that an electrical device converts electrical energy into another form (ex. light or heat)
Buying Energy20 Apr Class listSeating Plan Buying the POWER!!!! 20 Apr 2012.
Electrical Power & Efficiency. I will be able to calculate cost to operate and percent efficiency of various devices.
ENERGY. TYPES OF ENERGY Kinetic - energy in motion Potential - stored energy Chemical - energy stored in the bonds of molecules and atoms Nuclear energy-
P3 Revision summary. Primary sources of energy. Fossil fuels. Nuclear fuel. Renewable energy sources. What does primary mean?
WORK, ENERGY & POWER. Work A measure of the amount of energy transformed from one form to another For example, work is done when energy is used to.
Phantom Load: The power used by something while turned off Another word for phantom load is standby power.
Objectives Recap the different types of energy and energy transformations. Outcomes C: Describe different types of energy. B: Explain energy transformations.
Energy transformation. Law of Conservation of Energy The Law of conservation of energy says that energy is never gained or lost, it just changes form.
Questions Open your workbook to page 31 and 32 and do the questions. Use your notes from last class and your textbook to help you.
Recap from last time Environmental impacts hard to nail down Energy & electricity a big deal!
Energy & Power for APES Adapted from Maureen Goble.
P1.3 The usefulness of electrical appliances. We often use electrical appliances because they transfer energy at the flick of a switch. We can calculate.
ENERGY UNITS CALORIE (OLD UNIT) JOULE (J) (INTERNATIONAL UNIT) 1 CAL = J KILOJOULE (KJ) ONE CALORIE IS THE ENERGY NEEDED TO RAISE 1G OF WATER BY.
Paying for Electricity How much does it cost to watch T.V. for 2 hours?
Intro to energy. ENERGY - in Joules POWER - in watts OR J/s = rate of energy 1 watt = 1 Joule/second.
Page 404 SciencePower 9. Think about it In every step between mining coal, generating electricity, transmitting it to your home and lighting a lamp some.
Topic 7: Measuring Electric Power. Getting electricity to your home Power generating station transmission lines home Step- up transformer Step- down.
Write down the energy transfers in the following: Hydroelectric power station Fan Speakers Wind turbines.
Circuits are designed to control the transfer of Electrical Energy Chapter 9:
Electrical energy consumption Section 9. Lighting 40 Watts 100 Watts 60 Watts.
R EDUCING E LECTRICAL E NERGY C ONSUMPTION Lesson 12A.
Unit: Thermochemistry Heat, Temperature, Energy Conversions.
Energy Part 1 – Types, Usage, and Projections. Definitions Energy = the ability to do work Measured in joules Power = work/ time Measured in watts.
12.2 R EDUCING E LECTRICAL E NERGY C ONSUMPTION pp
The rate at which a device converts energy. The unit for power is the “watt” (we also use kilowatt and gigawatt depending upon the size) There are two.
Dynamic Electricity: Electric Energy &Power. Electric Power The electric power of a machine is an indication of the amount of work it can do, that is,
EGEE 102 – Energy Conservation And Environmental Protection Introduction.
Household Electricity. Generating Electricity An electric generator converts a mechanical power source into electricity The United States used coal, methane,
Measuring Electrical Energy Lesson 11. Measuring Electrical Energy What is Energy? Energy- The ability to do work Electrical Energy- The energy transferred.
Calculating Energy Use and Converting Units Chapter 2.
OCR 21 st Century Science Unit P3a Revision Sustainable energy.
Energy transformation. Law of Conservation of Energy.
Thermal Radiation Thermal radiation is energy transfer by electromagnetic waves All objects emit thermal radiation The hotter an object is, the more thermal.
Power and Efficiency. Power Power is defined as energy per unit time Electrical power describes the amount of electrical energy that is converted into.
Energy splat! Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy Watch this space!
Energy Consumption Energy consumption is measured in kilowatt. hours. A kilowatt hour is the amount of energy being consumed per hour. –Energy (kwh) =
© Boardworks Ltd of 7 Energy Transformations Part 4 – Efficiency.
Question 1) You have one light which offers 12 Ω of resistance and has 2 A of current running through it. Another light offers 6 Ω of resistance, with.
Power and Energy. Power Electric power - the rate at which electric energy is transformed into another form of energy such as light or heat. P=IV P =
Energy and Power. Energy The ability to do work. Measured in Joules.
CHAPTER 3 ENERGY. Common Units for Energy Joule Calorie Conversion: 1 calorie = Joules.
ENERGY. Energy Energy is measured in Joules (J) A joule is a small unit of energy NOT JEWELS like these -> JOULES.
Energy Efficiency. An incandescent light bulb uses about 5% of its input energy to create light and converts 95% of its input energy into heat.
Ch Electricity IV. Measuring Electricity (p ) Electrical Power Electrical Energy.
Electric Energy Using Electric Energy Energy can be neither created nor destroyed,…but it can be transformed from one kind to another.
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