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Energy, Work and Power
Quick questions on Energy stores and transfers explained: O-Level Physics
7short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is the main forms of energy?Show answer
Energy comes in several forms, all measured in joules ():
What are energy transfers?Show answer
Energy is transferred when it moves from one place or form to another. A torch transfers chemical energy in the battery to electrical energy, then to light and heat. A falling ball transfers gravitational potential energy to kinetic energy.
What is the principle of conservation of energy?Show answer
Energy cannot be created or destroyed. It can only be transferred from one form to another, or from one object to another, while the total energy stays the same:
What is wasted energy?Show answer
In any real transfer, some energy ends up in forms we did not want, usually heat (and sometimes sound), spread out into the surroundings. This energy is not destroyed; it is just wasted, no longer useful for the job in hand. This is why no machine is perfectly efficient.
What is q1?Show answer
State the principle of conservation of energy. [2 marks]
What is q2?Show answer
Name the energy transfers in a battery-powered torch. [2 marks]
What is q3?Show answer
A pendulum swinging slowly comes to rest. Explain where its energy has gone. [2 marks]
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