Electric Charge
Overview
Rub a balloon on your jumper and it sticks to the wall. Slide across a car seat on a dry day and a tiny spark jumps from your fingertip to the door handle. These everyday surprises are your first encounter with static electricity, a phenomenon that also powers photocopiers, cleans factory smoke, and poses real dangers when fuelling aircraft.
This topic explains how objects become charged, why charged objects attract or repel each other, and how we represent these forces using electric field lines. You will learn to distinguish conductors from insulators, trace the movement of electrons during charging by friction, and connect the physics to both its hazards and its practical applications.
Objectives
- Identify common materials that are electrical conductors or insulators, including metals and plastics
- Investigate how insulating materials can be charged by friction
- Explain how positive and negative electrostatic charges are produced on materials by the loss and gain of electrons
- Know that there are forces of attraction between unlike charges and forces of repulsion between like charges
- Explain electrostatic phenomena in terms of the movement of electrons
- Explain the potential dangers of electrostatic charges, e.g. when fuelling aircraft and tankers
- Explain some uses of electrostatic charges, e.g. in photocopiers and inkjet printers
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Electric Charge. 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.
- When a polythene rod is rubbed with a cloth, the rod becomes negatively charged. This is because: A) Protons move from the cloth to the rod B) Electrons move from the cloth to the rod C) Electrons move from the rod to the cloth D) Protons move from the rod to the cloth Answer: B
- Which of the following is an electrical insulator? A) Copper B) Aluminium C) Steel D) Plastic Answer: D
- Two objects both carry a negative charge. When brought close together they will: A) Attract each other B) Repel each other C) Have no effect on each other D) Neutralise each other Answer: B
- Electric field lines between two parallel charged plates are: A) Curved lines spreading outward B) Straight, parallel and evenly spaced C) Circular around the plates D) Pointing from negative to positive Answer: B
- What is the main danger of static charge building up during aircraft refuelling? A) The fuel becomes too hot B) A spark could ignite flammable fuel vapour C) The aircraft becomes magnetic D) The fuel flows too slowly Answer: B
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.
Recommended Books
Practice Mock Questions
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