Work, Energy, and Power | Lecture 1 | O Level & IGCSE Physics
Welcome to our Work, Energy, and Power series for O Level & IGCSE Physics! In this first lecture, we introduce the fundamental concepts of work, energy, and power, explaining key formulas and real-world applications.
In this comprehensive lecture, we'll be covering the fundamental concepts of Work, Energy, and Power in O Level and IGCSE Physics. This mega lecture is designed to help students excel in their exams, with a focus on past paper practice and solving problems from OCR and Edexcel. We'll delve into the world of energy, exploring kinetic energy, potential energy, and mechanical energy, as well as renewable energy sources such as solar power and nuclear energy. You'll learn how to calculate work done, understand the concept of power, and grasp the relationship between potential and kinetic energy. Whether you're preparing for O Level Physics or looking for a refresher on these essential topics, this lecture is perfect for you. So, let's get started and master Work, Energy, and Power!
1.7 Energy, work and power continued
1.7.3 Energy resources
1 List renewable and non-renewable energy sources
2 Describe how useful energy may be obtained, or electrical power generated, from:
(a) chemical energy stored in fossil fuels
(b) chemical energy stored in biofuels
(c) hydroelectric resources
(d) solar radiation
(e) nuclear fuel
(f) geothermal resources
(g) wind
(h) tides
(i) waves in the sea
including references to a boiler, turbine and generator where they are used
3 Describe advantages and disadvantages of each method limited to whether it is renewable, when and whether it is available, and its impact on the environment
1.7.4 Efficiency
1 Define efficiency as:
(a) (%) efficiency = (useful energy output) ( × 100%)
(total energy input)
(b) (%) efficiency = (useful power output) ( × 100%) (total power input)
and recall and use these equations
1.7.5 Power
1 Define power as work done per unit time and also as energy transferred per unit time; recall and use the equations
(a) power = work done time taken
P = Wt
(b) power = energy transferred
time taken P = ∆E
Back to contents page
www.cambridgeinternational.org/olevel 15
t
Cambridge O Level Physics 5054 syllabus for 2023, 2024 and 2025. Subject content