POS Key Concepts Heat transfer Insulation and thermal

POS § 2 b. Explain how heat is transmitted by conduction, convection and radiation

Unit C: Heat and Temperature Topic 6: Energy Transfer http: //www. wisconline. com/objects/View. Object.

How is energy transferred? § Radiation § Conduction § Convection § Tea light garden

Back up…what is energy? § The ability to do work § Can not be

Radiation (energy/transfer) § The only form able to travel through space § Emitted by

Albedo § Radiation is either reflected (by clouds, snow) or absorbed

What makes radiant energy special? § All radiant energy forms § Behave like waves

Conduction § Learning goals § Be able to explain conduction using the particle model

Conduction § Conduction is the process by which thermal energy is transmitted through collisions

Conduction § Conduction occurs when energy is passed directly from one item to another

Good Conductors vs. Bad Conductors (Insulators) § metal § Air § Wood § Sleeping

Convection § Convection is the transfer of energy in fluids, that is, liquids and

Convection-How it works § As temperature (thermal energy) increases: § § Particles move faster

Convection-How it works § As temperature (thermal energy) decreases: § § Particles move slower

Let’s go back to an earlier lesson and classify each example as § Conduction

Thermal energy devices: § Bathroom/bedroom § Hair dryer § Curling/straightening/crimping iron § Electric blanket

Cont’d § Kitchen § § Stove Coffee maker/tea kettle George Forman grill Microwave §

Internet link § Learnalberta. ca LA 05 7660 § Heat Transfer by conduction Gizmo

Assignments § Worksheet T 6 Radiation/Convection/Conduction § Topic 7+ 8 § Especially note Active

Slides: 37

Download presentation

POS § Key Concepts: § Heat transfer § Insulation and thermal conductivity § 2 a. Compare heat transmission in different materials (eg. Compare conduction of heat in different solids; compare the absorption of radiant heat by different surfaces

POS § 2 b. Explain how heat is transmitted by conduction, convection and radiation in solids, liquids and gases

Unit C: Heat and Temperature Topic 6: Energy Transfer http: //www. wisconline. com/objects/View. Object. aspx? I D=SCE 304

How is energy transferred? § Radiation § Conduction § Convection § Tea light garden pot heater § http: //www. bodymindsoulspirit. com/heata-room-for-only-15 -cents-a-day/

Back up…what is energy? § The ability to do work § Can not be created or destroyed, only transferred § Forms: § § § Chemical Mechanical Electrical Thermal Radiant (light) nuclear

Radiation (energy/transfer) § The only form able to travel through space § Emitted by the sun § Types of EMR Electromagnetic Radiation § § § § Radio waves Microwaves Infrared radiation Visible light spectrum ROYGBIV UV (ultraviolet) X-ray Gamma Ray Cosmic Rays

Albedo § Radiation is either reflected (by clouds, snow) or absorbed

What makes radiant energy special? § All radiant energy forms § Behave like waves § Can be absorbed and reflected by objects § Travel at the speed of light, 300 000 km/s

Conduction § Learning goals § Be able to explain conduction using the particle model of matter § Be able to explain that different materials conduct energy at different rates § Know that air is among poor heat conductors (insulation)

Conduction § Conduction is the process by which thermal energy is transmitted through collisions between neighboring particles § As temperature increases, particle speed increases, collisions increase, materials heat up more quickly § Common method of energy transfer for solids

Conduction § Conduction occurs when energy is passed directly from one item to another § If you stirred a pot of soup on the stove with a metal spoon, the spoon will heat up. The heat is being conducted from the hot area of the soup to the colder area of the spoon.

Good Conductors vs. Bad Conductors (Insulators) § metal § Air § Wood § Sleeping bags

Hot dog/Marshmallow sticks

Convection § Convection is the transfer of energy in fluids, that is, liquids and gases. § Hot fluids rise, cold fluids sink. § Flow is in a circular pattern

Convection-How it works § As temperature (thermal energy) increases: § § Particles move faster Spaces between particles increase The fluid becomes less dense Less dense fluids will float on top of more dense fluids § Helium balloons float in air § Molten wax floats on oil § Hot air floats on cold air

Convection-How it works § As temperature (thermal energy) increases: § § Particles move faster Spaces between particles increase (expansion) The fluid becomes less dense Less dense fluids will float on top of more dense fluids § Helium balloons float in air § Molten wax floats on oil § Hot air floats on cold air

Convection-How it works § As temperature (thermal energy) decreases: § § Particles move slower Spaces between particles decrease (contraction) The fluid becomes more dense More dense fluids will sink

Let’s go back to an earlier lesson and classify each example as § Conduction § Convection § Radiation

Clothing Irons

Clothes dryer

Stove, oven, furnace, fireplace

Thermal energy devices: § Bathroom/bedroom § Hair dryer § Curling/straightening/crimping iron § Electric blanket § Heaters § Radiator § Furnace

Cont’d § Kitchen § § Stove Coffee maker/tea kettle George Forman grill Microwave § Other § Fires-camping/candle/fireplace § Clothing Iron § Clothing dryer

Internet link § Learnalberta. ca LA 05 7660 § Heat Transfer by conduction Gizmo + questions § http: //www. explorelearning. com/index. cfm? method=c. Ext. Access. Secure. dsp. Resource&Res ource. ID=388

Assignments § Worksheet T 6 Radiation/Convection/Conduction § Topic 7+ 8 § Especially note Active and Passive Solar energy § Project pg 234 Making a Transfer § Review Q’s T 6 § pg 236 # 4 § Pg 237 #1, 2, 3, 4 § Take your own notes § Watch 1 st half of Crude Awakening: The Oil Crash