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dylan harper

on 3 May 2010

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Transcript of Energy

Energy is the ability to do work, the ability to exert a force on an object to move it Renewable sources of energy are
those which are not exhauistible, like
solar energy, wind energy and tidal energy.
Non-renewable energy can be used up or
deplated, they are fossil fuels and nuclear
energy sources. Steel, plastic, and wood are all solids,
ice is solid water. Solids means they
are close together, they cant move
place to place. Murcury, lemonade, and
water are liquids, liquids mean they can move around each other. Air, and helium are gases, water vaper is water as gas, gas means they are far apart and they can move in every directions. You cant collect or consume energy
without causing certain changes to the
environment, the effects of recovering and
using energy are far reaching and can be
seen at each stage of of the energy cycle. Here are seven different types of energy
mechanical energy, chemical energy,
muscular energy, thermal energy, light
energy, electrical energy, and nuclear energy. There are many types of energy that we
use in transportation Sailboat mechanical energy (wind), Walking, roller skating, cycling, canoeing muscular energy (food), Train chemical energy ( fossil fuels), Car chemical energy ( fossil fuels). The most efficient means of transportation in terms of energy utilization is the bicycle. To cover one kilometre, a cyclist expends 20 to 100 times less energy than a car driver.

There are various transformations of energy in a steam-driven locomotive. The chemical energy released from the burning coal is used to heat water and produce steam. The steam drives the pistons that make the wheels turn. Part of the driving motion of the pistons is used to power generators that create electrical energy for heat and light.

The transformation of energy is never 100% efficient because we cannot usefully capture all the energy supplied by one source for some operations, energy conversion from one form to another may approach 100% efficiency. Water is always in motion. It evaporates into the air in the form of water vapour. Warm air can hold more water vapour than cold air. As warm air rises from a body of water it takes a lot of water vapour with it. Sooner or later this warm, water-laden air cools, and the water vapour turns into rain. The rain falls on the Earth, flows down creeks and rivers to lakes, and eventually is either evaporated again or returns to the oceans. This water cycle is repeated over and over again.

What is energy What are sources of energy Energy and the environment Different types of energy Energy in transportation Solids, Liquids, Gas What are transformations of energy? How efficient is the transformation of energy? What is a water cycle What is the Law of Conservation of Energy? The Law of Conservation of Energy states that energy in the universe can be neither created or destroyed. This law was formulated in the by German scientists Hermann von Helmholtz and Julius Robert von Mayer. By, Dylan
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