1 / 12

Physics and Astronomy Outreach Program at the University of British Columbia

Energy Use at Home Home Heating. Multiple-Choice Questions (Junior Science Level). Physics and Astronomy Outreach Program at the University of British Columbia. Home Heating. Question 1.

anoush
Download Presentation

Physics and Astronomy Outreach Program at the University of British Columbia

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Energy Use at Home Home Heating Multiple-Choice Questions (Junior Science Level) Physics and Astronomy Outreach Program at the University of British Columbia

  2. Home Heating Question 1 You come into a cold room and switch on the space heater. Which statement is true during the time when the temperature in the room is rising? The power delivered by the heater is larger than the heat lost from the room. The power delivered by the heater is smaller than the heat lost from the room. The power delivered by the heater is the same as the heat lost from the room. Physics and Astronomy Outreach Program at the University of British Columbia

  3. Home Heating Question 1 Answer You come into a cold room and switch on the space heater. Which statement is true during the time when the temperature in the room is rising? The power delivered by the heater is larger than the heat lost from the room. The power delivered by the heater is smaller than the heat lost from the room. The power delivered by the heater is the same as the heat lost from the room. Physics and Astronomy Outreach Program at the University of British Columbia

  4. C (heat loss to cold air through conduction) House A Energy Flow In (from sunshine) Heat generated inside house B Energy Flow In (“fuel”) Home Heating Question 2 On a cold, still day, you are trying to determine the energy balance of your home. Which of these assumptions of energy flow is unreasonable? D (heat loss to the air through convection) E (heat loss to cold air through radiation) Physics and Astronomy Outreach Program at the University of British Columbia

  5. C (heat loss to cold air through conduction) House A Energy Flow In (from sunshine) Heat generated inside house B Energy Flow In (“fuel”) Home Heating Question 2 Answer On a cold, still day, you are trying to determine the energy balance of your home. Which of these assumptions of energy flow is unreasonable? D (heat loss to the air through convection) E (heat loss to cold air through radiation) Physics and Astronomy Outreach Program at the University of British Columbia

  6. Home Heating Question 2 Solution • The sun’s radiation energy will enter the house through the window. The furnace will heat up the house, as will many appliances within the house (lights, people). • As the house warms up, heat will be lost to the air through radiation and convection, not conduction. This is because the heat is lost to a mobile fluid (the air), not a solid, even though the mobile fluid is still. If it were a windy day, it would be forced convection. Physics and Astronomy Outreach Program at the University of British Columbia

  7. Home Heating Question 3 Suppose you are an astronaut in space, hard at work in your sealed spacesuit. The only way that you can transfer heat to the environment is by: Conduction Convection Radiation Evaporation Physics and Astronomy Outreach Program at the University of British Columbia

  8. Home Heating Question 3 Answer Suppose you are an astronaut in space, hard at work in your sealed spacesuit. The only way that you can transfer heat to the environment is by: Conduction Convection Radiation Evaporation Physics and Astronomy Outreach Program at the University of British Columbia

  9. Home Heating Question 3 Solution In space there is no matter. Both conduction and convection require matter to transfer heat. Radiation as means of heat transfer does not require any medium and there is no exchange of mass. Physics and Astronomy Outreach Program at the University of British Columbia

  10. Home Heating Question 4 A kWh in B.C. costs currently ~ 7.0 cents. The total energy consumption in a 1000 ft2(~100m2) large apartment is approximately 200 MJ per day. If the apartment is heated electrically, what’s the energy cost each month? • Less than $ 25 • $ 25 • $ 50 • $ 100 • More than $ 100 Physics and Astronomy Outreach Program at the University of British Columbia

  11. Home Heating Question 4 Answer A kWh in B.C. costs currently ~ 7.0 cents. The total energy consumption in a 1000 ft2(~100m2) large apartment is approximately 200 MJ per day. If the apartment is heated electrically, what’s the energy cost each month? • Less than $ 25 • $ 25 • $ 50 • $ 100 • More than $ 100 Physics and Astronomy Outreach Program at the University of British Columbia

  12. Home Heating Question 4 Solution Physics and Astronomy Outreach Program at the University of British Columbia

More Related