JAMB/WAEC Physics 2027 EP 9 - Capacitors; Series, Parallel, Energy Stored + Likely Exam Questions

JAMB/WAEC Physics EP 9 – Capacitors: Series, Parallel & Energy Stored + Likely Exam Questions Welcome to O3Schools Physics Tutorials. In this lesson, we study Capacitors, one of the most important topics in Electrostatics and Current Electricity. Questions on capacitors frequently appear in JAMB, WAEC, NECO, and Post-UTME Physics examinations. WHAT YOU WILL LEARN • Meaning of Capacitor • Capacitance • Functions of Capacitors • Capacitors in Series • Capacitors in Parallel • Energy Stored in a Capacitor • Applications of Capacitors • Likely Exam Questions WHAT IS A CAPACITOR? A capacitor is an electrical device used to store electric charges and electrical energy. A simple capacitor consists of two conducting plates separated by an insulating material called a dielectric. CAPACITANCE Capacitance is the ability of a capacitor to store electric charge. Unit: Farad (F) FACTORS AFFECTING CAPACITANCE • Area of the plates • Distance between the plates • Nature of the dielectric material FUNCTIONS OF CAPACITORS • Energy storage • Smoothing electrical signals • Tuning radio circuits • Camera flashes • Power supply units CAPACITORS IN SERIES When capacitors are connected end-to-end, they are said to be in series. Characteristics: • Same charge flows through each capacitor • Total capacitance decreases For two capacitors: 1/C = 1/C₁ + 1/C₂ CAPACITORS IN PARALLEL When capacitors are connected across the same terminals, they are said to be in parallel. Characteristics: • Same voltage across all capacitors • Total capacitance increases Total Capacitance = C₁ + C₂ + C₃ ENERGY STORED IN A CAPACITOR A charged capacitor stores electrical energy. The amount of energy stored depends on: • Capacitance • Voltage applied Higher voltage generally results in more stored energy. APPLICATIONS OF CAPACITORS • Television sets • Radio receivers • Computers • Mobile phones • Electronic circuits • Camera flash units LIKELY EXAM QUESTIONS 1. A capacitor is used primarily to: A. Produce heat B. Store electric charge C. Measure current D. Generate light Answer: B 2. The SI unit of capacitance is: A. Ohm B. Volt C. Farad D. Ampere Answer: C 3. When capacitors are connected in parallel, the total capacitance: A. Decreases B. Becomes zero C. Increases D. Remains unchanged Answer: C 4. In a series connection of capacitors: A. Total capacitance increases B. Total capacitance decreases C. Voltage becomes zero D. Charge disappears Answer: B 5. Which of the following is an application of a capacitor? A. Electric heater B. Radio tuning circuit C. Water pump D. Generator belt Answer: B PAST QUESTION Two capacitors of 4 µF and 6 µF are connected in parallel. Calculate the equivalent capacitance. Solution Total Capacitance = C₁ + C₂ = 4 + 6 = 10 µF Answer: 10 µF COMMON JAMB AND WAEC EXAMINATION AREAS • Capacitance • Capacitors in Series • Capacitors in Parallel • Energy Storage • Applications of Capacitors • Farad and Units WHO SHOULD WATCH? ✓ JAMB Candidates ✓ WAEC Candidates ✓ NECO Candidates ✓ GCE Candidates ✓ Post-UTME Candidates ✓ Science Students ✓ Engineering Aspirants SEARCH KEYWORDS Capacitors, Capacitance, Capacitors in Series, Capacitors in Parallel, Energy Stored in a Capacitor, Electrostatics, JAMB Physics Tutorial, WAEC Physics Tutorial, Physics Questions and Answers, O3Schools Physics Tutorials. If you are searching for Capacitors, Capacitance, Capacitors in Series, Capacitors in Parallel, Electrostatics, Physics Lessons, JAMB Physics Tutorials, WAEC Physics Lessons, Physics Calculations, or free Physics tutorials online, O3Schools is your trusted learning destination. #JAMBPhysics #WAECPhysics #Capacitors #Capacitance #Electrostatics #PhysicsTutorial #O3Schools #JAMBTutorials #WAECTutorials #PhysicsLessons