Page 1: Power and Energy Fundamentals
This page introduces the fundamental concepts of power and energy calculations, focusing on average and instantaneous power measurements. The mathematical relationships between power, energy, and time are thoroughly explained through formulas and derivations.
Definition: Average power is measured in watts (W) and represents the rate of energy transfer over time.
Vocabulary: Instantaneous power (puissance instantanée) refers to the power at a specific moment, calculated as the derivative of energy with respect to time.
Example: The relationship between energy and power is demonstrated through the integral formula: E(t) = ∫P(t)dt
Highlight: The efficiency (rendement) calculation is introduced as the ratio of useful energy to absorbed energy: η = E(utile)/E(absorbée)
The page concludes with references to additional problems and exercises found on page 31, specifically problems 7, 8, 10, and 14.