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22-May-2016 07:51 by 3 Comments

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At night, street lamps use electrical energy to light our way. We learned the definition of energy in the introduction: With a pencil, try this example to know the two types of energy. Btu is the amount of heat energy it takes to raise the temperature of one pound of water by one degree Fahrenheit, at sea level. One thousand Btus roughly equals: One average candy bar or 4/5 of a peanut butter and jelly sandwich. A thousand joules is equal to a British thermal unit.

You used your own energy to lift and move the pencil. As it rests on the desk, the pencil has potential energy. The term "joule" is named after an English scientist James Prescott Joule who lived from 1818 to 1889. One joule is the amount of energy needed to lift something weighing one pound to a height of nine inches.So, if you lifted a five-pound sack of sugar from the floor to the top of a counter (27 inches), you would use about 15 joules of energy.Around the world, scientists measure energy in joules rather than Btus.It's much like people around the world using the metric system of meters and kilograms, instead of the English system of feet and pounds.Like in the metric system, you can have kilojoules — "kilo" means 1,000.1,000 joules = 1 kilojoule = 1 Btu A piece of buttered toast contains about 315 kilojoules (315,000 joules) of energy.

With that energy you could: Energy can be transformed into another sort of energy.But it cannot be created AND it cannot be destroyed. Here are some changes in energy from one form to another. When your body uses that stored energy to do work, it becomes kinetic energy.Stored energy in a flashlight's batteries becomes light energy when the flashlight is turned on. If you overeat, the energy in food is not "burned" but is stored as potential energy in fat cells.When you talk on the phone, your voice is transformed into electrical energy, which passes over wires (or is transmitted through the air).The phone on the other end changes the electrical energy into sound energy through the speaker.A car uses stored chemical energy in gasoline to move.

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