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Conservation of energy Typeit
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During any process, energy will be transferred from one store to another. For instance, using a battery to heat up some water transfers energy from a store of energy in the battery to a store of energy in the water. This energy is transferred by the current generated by the battery.
When a ball is thrown up, it slows down until it stops, and then accelerates back down to the ground. As the ball moves upwards, the ball's store of energy is transferred into a store of energy. If a ball is initially thrown up at a speed of 5 m/s, it will stop at a height of m. (Note: use gravitational field strength = 10 m/s2.)
Not all energy gets transferred in a useful way. Often during a process, energy will be transferred as heat to the environment, which can't be recovered. Energy transferred in this way has been .
The efficiency of a process is a measure of how much of the total energy transferred has been transferred usefully. If a kettle uses 300 kJ to boil, but 60 kJ of that is transferred in a non-useful way to the rest of the kitchen, the efficiency of the kettle is . The efficiency of many processes can be improved by .
Society uses energy for a huge range of applications, from the electricity used to power the computer you're on now, to heating homes and powering cars. Because of this, where we get this energy from is very important. Society uses a variety of energy resources which are renewable; for example, power, which uses energy from the Sun, or power, which uses the gravitational potential energy of water. Other resources, such as are non-renewable and can have serious effects on the environment, so it is important to consider when, where, how and if these get used.
When a ball is thrown up, it slows down until it stops, and then accelerates back down to the ground. As the ball moves upwards, the ball's store of energy is transferred into a store of energy. If a ball is initially thrown up at a speed of 5 m/s, it will stop at a height of m. (Note: use gravitational field strength = 10 m/s2.)
Not all energy gets transferred in a useful way. Often during a process, energy will be transferred as heat to the environment, which can't be recovered. Energy transferred in this way has been .
The efficiency of a process is a measure of how much of the total energy transferred has been transferred usefully. If a kettle uses 300 kJ to boil, but 60 kJ of that is transferred in a non-useful way to the rest of the kitchen, the efficiency of the kettle is . The efficiency of many processes can be improved by .
Society uses energy for a huge range of applications, from the electricity used to power the computer you're on now, to heating homes and powering cars. Because of this, where we get this energy from is very important. Society uses a variety of energy resources which are renewable; for example, power, which uses energy from the Sun, or power, which uses the gravitational potential energy of water. Other resources, such as are non-renewable and can have serious effects on the environment, so it is important to consider when, where, how and if these get used.