Physics: Electricity: Units
Overview
Every circuit calculation depends on using the correct electrical units. Confusing milliamps with amps, or forgetting the relationship between volts, joules and coulombs, leads to answers that are orders of magnitude wrong.
This reference covers the seven SI units for the electricity section of the Edexcel specification: ampere, coulomb, joule, ohm, second, volt and watt.
Objectives
- Use the following units: ampere (A), coulomb (C), joule (J), ohm (Ohm), second (s), volt (V) and watt (W)
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Physics: Electricity: 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 charge is: A) Ampere B) Coulomb C) Volt D) Ohm Answer: B
- How many amperes is 750 mA? A) 7.5 A B) 0.75 A C) 75 A D) 0.075 A Answer: B
- One volt is equivalent to: A) One joule per second B) One coulomb per second C) One joule per coulomb D) One ampere per ohm Answer: C
- What is the unit of power? A) Joule B) Coulomb C) Newton D) Watt Answer: D
- 3.3 kilohms is equal to: A) 33 ohms B) 330 ohms C) 3300 ohms D) 33000 ohms Answer: C
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