Electricity: Units
Overview
Circuits involve several quantities that look similar at first glance: current, charge, voltage, resistance, energy, and power. Each has its own unit, and mixing them up is one of the fastest ways to lose marks. A solid grasp of these units turns every electricity calculation into a routine substitution.
This reference lists the seven units the Edexcel specification requires for the Electricity section: ampere, coulomb, joule, ohm, second, volt, and watt. You will learn what each one measures, how they relate to one another, and how to recall them under exam conditions.
Objectives
- Use the following units: ampere (A), coulomb (C), joule (J), ohm (ohm), second (s), volt (V) and watt (W)
Mind map
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Flashcards
Quick recall practice on the facts this topic is tested on.
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on 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.
- What is the SI unit of electric charge? A) A B) V C) C D) W Answer: C
- Resistance is measured in: A) volts B) amperes C) watts D) ohms Answer: D
- One volt is equivalent to: A) one joule per ampere B) one joule per coulomb C) one coulomb per second D) one watt per ampere Answer: B
- How many milliamps are in 2.5 A? A) 0.0025 mA B) 25 mA C) 250 mA D) 2500 mA Answer: D
- Which quantity is measured in watts? A) Energy B) Charge C) Power D) Resistance Answer: C
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Recommended Books
Practice Mock Questions
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