Electric Potential and Capacitors - Physics (Undergraduate Foundation)

Electricity is more than just flowing current; it is about stored energy and the pressure that moves it. This course explains electric potential energy and potential difference, showing how charges interact in space. You will learn about electric dipoles and how capacitors hold electrical energy in fields. We cover calculating capacitance for components in series and parallel, alongside the role of dielectrics in increasing storage capacity. Understanding these concepts is vital for anyone working with electronics or power systems. Capacitors are in almost every device, from camera flashes to computer motherboards, where they smooth out power or store quick bursts of energy. Mastering these principles allows you to design better circuits and understand how modern energy storage works in real-world hardware. This knowledge forms the base for advanced studies in electrical engineering and applied physics. By the end of this module, you will calculate electric potential and work done on charges with precision. You will solve complex problems involving capacitor networks in different configurations. You will explain how dielectric materials change the behaviour of electric fields and increase energy density. These skills ensure you can analyse and build functional electronic paths that handle energy efficiently. This course is for undergraduate science and engineering students needing a solid foundation in electromagnetism. It also benefits secondary school leavers preparing for university-level physics or technical exams. Even hobbyists building simple electronic gadgets will find these lessons useful for choosing the right components for their projects. The focus remains on clear, practical physics that translates directly to classroom success and technical work.

Enrolment valid for 12 months

This course is also part of the following learning track. You may join the track to gain comprehensive knowledge across related courses.

PHY 102: General Physics II - Electricity and Magnetism

Electricity and magnetism run every home, factory, and phone all over the world. This track builds the technical foundation to master laws governing electrical energy and signals. You will progress from stationary charges to alternating current and electromagnetic waves. It simplifies the NUC CCMAS syllabus into actionable knowledge for solving practical technical problems. The programme is for first-year university and polytechnic students in engineering or physical sciences. It also serves school leavers preparing for university physics or technical entrance exams. Science teachers and technicians who need a solid refresher on core electrical principles will find the material direct and relevant to their work. You will learn to calculate electrical forces, design functional DC and AC circuits, and predict how magnetic fields drive motors and generators. You will master the use of Gauss's Law, Kirchhoff's rules, and Maxwell's equations to solve engineering challenges. Completing this track ensures success in PHY 102 exams and prepares you for a career in power systems, telecommunications, or renewable energy.

Course Chapters

1. Introduction

This chapter establishes the relationship between electrostatic forces and energy. You will learn how work is done to move charges through space and how that work is stored as potential energy. You will define electric potential energy and potential difference; apply the principle of conservation of energy to moving charges; and convert energy values between Joules and electron-volts.

Concept Overviews

5 Lessons

Problem Walkthroughs

2 Lessons

2. Electric Potential

This chapter covers the spatial distribution of electric potential around various charge configurations. You will master the link between electric fields and the rate of change of potential. You will calculate potential for point charges and continuous distributions; apply the superposition principle; use the potential gradient to find electric fields; and identify equipotential surfaces.

Concept Overviews

6 Lessons

Problem Walkthroughs

3 Lessons

3. Electric Dipoles

This chapter analyses the potential created by a pair of equal and opposite charges. Dipole analysis is critical for understanding molecular interactions and dielectric materials. You will derive and apply formulas for electric dipole potential at both axial and arbitrary angular positions in space.

Concept Overviews

1 Lesson

Problem Walkthroughs

2 Lessons

4. Capacitance

Capacitors are fundamental components that store energy in electric fields. You will learn the geometric and physical factors that determine how much charge a device can hold. You will define the unit Farad; calculate capacitance for parallel plates; and determine the electrical energy stored in various charging states.

Concept Overviews

3 Lessons

Problem Walkthroughs

2 Lessons

5. Capacitor Networks

Components in circuits are rarely used alone and are often combined to achieve specific capacitance values. This chapter teaches you to simplify complex arrangements into equivalent values. You will master series and parallel connection rules; solve for equivalent capacitance in mixed networks; and calculate voltage distribution across individual capacitors.

Concept Overviews

3 Lessons

Problem Walkthroughs

2 Lessons

6. Dielectrics

Dielectric materials enhance the performance of capacitors by increasing their energy storage and preventing breakdown. This chapter explains the physics of insulating materials in electric fields. You will explain polarisation; define the dielectric constant and strength; and calculate the resulting increase in capacitance and maximum charge storage.

Concept Overviews

4 Lessons

Problem Walkthroughs

2 Lessons

7. Conclusion

This final chapter consolidates the principles of electric potential, energy storage, and capacitor performance. It serves as a review for the core relationships mastered in the course. You will summarise the primary laws of potential and capacitance and prepare for advanced topics in current electricity and circuit design.

Concept Overviews

1 Lesson