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T172 Working with our Environment Technology for a sustainable future

T172 Working with our Environment Technology for a sustainable future. First Tutorial 21/2/04. Introductions. name where are you from? what do you do? other OU courses? why are you taking T172?. Course Aims. To enable you to understand:

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T172 Working with our Environment Technology for a sustainable future

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  1. T172 Working with our EnvironmentTechnology for a sustainable future First Tutorial 21/2/04

  2. Introductions • name • where are you from? • what do you do? • other OU courses? • why are you taking T172?

  3. Course Aims To enable you to understand: 1.a) how the use of technology to meet human material needs contributes to environmental effects, and   b) how technology may be used to protect the environment;  2.how technology may be employed to design products, processes and systems that contribute to the development of an environmentally sustainable future.

  4. Course structure Preparing for T172 Introduction to T172 Themes Course Guide Files Theme 1 You and Your Environment Energy The Sciences Good Study Guide Theme 2 Travelling Light Glossary Resources Theme 3 Food Chains Audio Visual Material Human and Ecosystem Health Theme 4 The Global Context Optional Computing

  5. Study techniques • Allocate time • Use “dead” time • Plan ahead • Be selective • Tutor support • Self study groups

  6. Assessment • Preparatory exercises • 5 TMAs • End of course assessment (ECA)

  7. TMAs • Plan ahead • Don’t leave until last minute! • Read questions carefully • Look at mark allocations • Try to answer all questions • Tidy and legible • Appropriate length • Post before cut off date • Get certificate of posting • Weigh - ensure enough stamps! • Extensions

  8. Any problems?

  9. Maths • ughhh!

  10. Our Impact on the environment • List the main environmental impacts caused by UK households • Rank them

  11. What is energy? • Capacity to do work • Units • joules (J) • 1J = 1 Nm

  12. Energy Conversion • Energy cannot be created or destroyed • It is converted from one form to another • List some forms of energy • What is the exception to this rule? • E = mc2

  13. Heat Light Energy Conversion • Example - A fire burning Chemical

  14. Exercise - Energy conversion • Electricity supplied to an electric drill • An immersion heater heating water for a bath • Car tyres heated up as the car brakes rapidly • A clockwork toy train running round a track • Water from a reservoir used to generate electricity

  15. What is power? • Rate of work, or • Rate of energy conversion • Units • watts (W) = Js-1

  16. An Analogy Distance travelled h energy Speed h Power

  17. Exercise • An electric fire has a rating of 1000 W. How many joules does it consume in 1 hour?

  18. Answer Power (watts) = Energy (joules) time (secs) So, Energy (joules) = Power (watts) x time (secs) So, Energy = 1000 W x (60 x 60 s) = 1000 W x 3600 s = 3,600,000 J = 3.6 x 106 J = 3.6 MJ

  19. Units • kilowatt hours (kWh) • Alternative unit of energy • 1 kWh = 3.6 MJ * * See previous page for derivation of this relationship

  20. Units - Prefixes • kilo 103 • Mega 106 • Giga 109 • Terra 1012 • Peta 1015 • Exa 1018 KMGTPE (King Midas' golden touch poisoned everything)

  21. Exercise • Express 1,000,000 kJ as • MJ • TJ • PJ

  22. Answer • 1,000,000 kJ is equivalent to • 1,000 MJ • 0.001TJ • 0.000001 PJ

  23. Exercise • Express 7.2 x 106 kJ as • MJ • GJ • PJ • kWh

  24. Answers • 7.2 x 106 kJ is equivalent to: • 7.2 x 103 MJ • 7.2 GJ • 7.2 x 10 - 6 PJ • 2 x 103 kWh

  25. Exercise • Convert the following into kWh • 3.6 MJ • 3.6 GJ • 7.2 PJ

  26. Answers • 3.6 MJ = 1 kWh • 3.6 GJ = 1,000 kWh • 7.2 PJ = 2 x 109 kWh

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