Electrical energy can also be produced by a generator, which is a machine which is used in power stations.
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1 Electrical energy A torch battery has chemical energy stored in it. When the battery is connected in a circuit, this chemical energy is changed into electrical energy, which is then carried by the electricity from the battery to a light globe where it can be changed into light. Electrical energy can also be produced by a generator, which is a machine which is used in power stations. Electrical energy can be used to drive an electric motor or make a hair dryer work. Electrical energy is carried by the electrons through a circuit. Mechanical energy There are two types of mechanical energy: stored energy (potential energy) and motion energy (kinetic energy). Stored energy (potential energy) When you stretch a rubber band you are storing energy in the rubber. You can feel this stored energy when you let it go. It can sting your fingers or it can zoom across the room. You can store energy in lots of other stretchy and squeezy materials, such as elastic, springs and stretch fabrics. When you jump on a trampoline, as you go down some of your energy is stored in the stretched springs around the edge of the mat. This energy is then used to help lift you high into the air on the rebound. Many old-fashioned clocks had a large metal spring inside them. When you wind the clock you store energy in the spring. This energy is then used to keep the clock going for days. Another example of stored energy is when an object has been lifted. For example,
2 when a brick is lifted above the ground it has stored energy in it. If it is let go, it will fall and do damage when it hits the ground. A high diver has lots of stored energy when they are on the diving platform. When they dive this stored energy helps make the splash when they hit the water. Stored energy is also called potential energy. Motion energy (kinetic energy) When a ball is bowled in a bowling alley it moves down the lane until it hits the pins at the other end. With a bit of skill it will knock over many pins. The bowling ball had lots of motion energy which it used to knock the pins over. Any moving object has motion energy. A moving cricket ball has the energy to knock over the stumps. The motion energy in a moving car can do great damage if it hits another car. The wind has a lot of motion energy, and this can be used to turn windmills or wind generators. Motion energy is also called kinetic energy. Energy transformations The main forms of energy are: * electromagnetic waves (eg light, infrared, ultraviolet and solar) * heat * sound * electrical * mechanical * stored or potential and motion or kinetic energy. Any of the above forms of energy can be changed into other forms of energy. However, no energy is ever lost, nor can it be created from nothing. This can be stated as a law so that it can be applied to new situations as they are encountered:
3 Energy is never created or lost, it can only be converted from one form of energy to other forms of energy. When a matchstick is lit, the chemical energy in the match changes into heat energy and light energy. This can be represented by an energy flow diagram. Energy diagram for a burning match A diver on a high diving platform has stored (potential) energy. When they dive this stored energy is converted to motion energy as they accelerate downwards. When they hit the water this motion energy is transformed into the sound energy of the splash and the motion energy of the water.
4 Conversion of potential energy to other forms A CD player uses the electrical energy in a battery to produce sound energy. This can be represented by an energy flow diagram. Energy diagram for a CD player A small amount of heat energy may also be produced, but this is usually unwanted, wasted energy. An appliance is more efficient if less energy is changed into the unwanted forms of energy. What is energy? Your body gets energy from the food that you eat. This energy gives you the ability to do lots of work. You need energy to cut the lawn or dig a hole. Athletes who compete in marathons need to get lots of energy from their food to help them through the event. Machines also need energy for them to do work. A car would not go if it could not get energy from its fuel. A blender needs to get energy from the electricity it uses in order to work in the kitchen. Energy is the capacity to do work. If a living thing has lots of energy, it can do lots of work. When it does the work it transforms energy from one form to another.
5 If a machine has lots of energy in its fuel, it can do lots of work. When it does the work it transforms the energy into other forms. The sources of energy There are many natural substances that contain lots of energy. Most of these are called fuels or foods. Coal, oil and natural gas all contain chemicals that can supply lots of energy. Many foods contain chemicals that can supply lots of energy. Fatty foods contain large amounts of energy. Sugary food (called carbohydrates) also contain lots of energy. The energy in the fuels and foods originally came from the Sun. The Sun is producing huge amounts of energy all the time. Some of this energy comes to the Earth in the form of heat energy and light energy. The plants use some of the light energy from the Sun to make their own food in the process called photosynthesis. This energy is stored in the plants. When we eat the plants we consume this energy. Animals also get their energy by eating the plants. Some animals get their energy by eating the animals that ate the plants. Oil and coal come from the decayed and buried remains of ancient plants and animals. So the energy in oil and coal originally came from the Sun.
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