Physics: Electricity: Units
Overview
Electricity calculations involve several quantities that look similar at first glance - current, charge, voltage, resistance, energy and power. Each has its own SI unit, and mixing them up is one of the fastest ways to lose marks in an exam.
This lesson 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 connect through equations, and how to handle the metric prefixes that appear in real circuit problems.
Objectives
- Use the following units: ampere (A), coulomb (C), joule (J), ohm (Ohm), second (s), volt (V) and watt (W)
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) Volt C) Coulomb D) Watt Answer: C
- Resistance is measured in: A) volts B) amperes C) ohms D) watts Answer: C
- One volt is equivalent to: A) one joule per second B) one joule per coulomb C) one coulomb per second D) one watt per ampere Answer: B
- How many milliamps are in 1.5 A? A) 0.015 mA B) 15 mA C) 150 mA D) 1500 mA Answer: D
- Which quantity is measured in watts? A) Energy B) Charge C) Power D) Resistance Answer: C
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Practice Mock Questions
Want to practice mock questions on Physics: Electricity: Units? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
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