Textbook: Homework: pg # 12 – 28 (even only)

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Textbook: 7.1 - 7.3 Homework: pg. 241 - 242 # 12 – 28 (even only) Energy, Work and Power Textbook: 7.1 - 7.3 Homework: pg. 241 - 242 # 12 – 28 (even only)

Energy and Work Energy is the ability to do work Ex. Kinetic, Thermal, Gravitational, Elastic, Chemical, Electric, Magnetic, Radiant… Work is the transfer of energy

James Prescott Joule (1818 – 1889): English physicist Discovered relationship btw. heat & mechanical work (energy) Conservation of Energy Theorem

Pg 218

Power Power is the rate at which work is done [N.m] ,[J] Joule Pg. 241 #23, 24, 28 [W] watt [s] second James Watt (1736 – 1819): Scottish inventor/mechanical engineer. Improved the efficiency of steam engines. Introduced horse power (750 watts).

If a hair dryer does 3000 J of work to heat the air every two seconds, what is its power?

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