Physics: Magnetism And Electromagnetism: Units
Overview
An electromagnet, a loudspeaker and an electric motor are all described by just three units: the ampere, the volt and the watt. Between them they answer how much charge is flowing, how hard it is being pushed, and how fast energy is being delivered.
In this lesson you will meet each of the three, see how the volt and the watt are built out of simpler units, practise the prefix conversions that appear on every device label, and use units as a quick check that a calculation has been set up the right way round.
Objectives
- Use the following units: ampere (A), volt (V) and watt (W)
Mind map
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Flashcards
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Physics: Magnetism And Electromagnetism: Units. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The SI unit of electric current is the: A) Volt B) Watt C) Ampere D) Coulomb Answer: C
- One volt is the same as: A) One joule per second B) One joule per coulomb C) One coulomb per second D) One watt per second Answer: B
- A device works at 12 V and draws 3 A. Its power is: A) 4 W B) 9 W C) 15 W D) 36 W Answer: D
- 250 mA expressed in amperes is: A) 0.025 A B) 0.25 A C) 2.5 A D) 250 000 A Answer: B
- One watt is the same as: A) One joule per coulomb B) One joule per second C) One coulomb per second D) One volt per ampere Answer: B
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Practice Mock Questions
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