Download - Lecture Eighteen Physics 100 Fall 2012
No Lab Tomorrow. Lab WILL BE HELD Wednesday, Thursday
and Tuesday of next week. Second writing assignment due on
12/12/12 Exam 3 discussion
An electric motor is a device that converts electrical energy into mechanical energy.
Electric motors use magnetic force to cause motion.
Amount of energy transfered
how long it took for the transferPower P
( ) (how long you use it) Amount of energy transferedPower x
Watt x hour or a kilowatt-hour is a unit of energy which can be converted into a Joule.
Kinetic energy (or mechanical energy) is energy associated with motion.
KE=½ mv2 where m is the mass of an object and v is velocity or speed
Energy is not created or destroyed.
Rather, energy changes form (electrical to mechanical for example).
Or, is transferred from one object to another.