Chapter 37- Work, Power And Energy Flashcards Preview

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Flashcards in Chapter 37- Work, Power And Energy Deck (9)
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1

Power

Work
------
Time taken

Watt, power is the rate at which work is done

2

Energy

The ability to do work J

3

Principal of Conservation of Energy

Energy is neither created nor destroyed but can be converted from one from another

4

Non-renewable sources

Eg. Oil, coal, has, turf
Advantages -
•easy to get
•reasonably cheap
Disadvantages -
•cause greenhouse gas emissions
•pollute the atmosphere

5

Solar Energy

Advantage
-free
-no pollution

Disadvantage
-isn't efficient
-expensive to make

6

Hydro-electricity

Building of a dam, when water is released it releases kinetic energy

Advantages:
•no pollution
•cost efficient

Disadvantages
•flooding destroys land

7

Wind energy

Advantages
•no pollution
•free

Disadvantages
•none produced on calm days
•noisy, spoil scene

8

Nuclear energy

Nuclear fission is not renewable (uses uranium)
Nuclear fusion uses water, but cannot done yet

Advantages
•makes a lot of energy
•reduces greenhouse gas emission

Disadvantages
•nuclear explosions
•radioactive waste very harmful

9

Work

Force X distance
Work is present is you apply force to an object and it moves
Measured in joules