Energy Use at Home Heating Multiple-Choice Questions Junior

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

Question 1 Home Heating 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? A. The power delivered by the heater is larger than the heat lost from the room. B. The power delivered by the heater is smaller than the heat lost from the room. C. 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

Question 1 Answer Home Heating 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? A. The power delivered by the heater is larger than the heat lost from the room. B. The power delivered by the heater is smaller than the heat lost from the room. C. 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

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? C A Energy Flow In (from sunshine) B Energy Flow In (“fuel”) House Heat generated inside house (heat loss to cold air through conduction) 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

Question 2 Answer Home Heating 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? C A Energy Flow In (from sunshine) B Energy Flow In (“fuel”) House Heat generated inside house (heat loss to cold air through conduction) 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

Question 2 Solution Home Heating 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

Question 3 Home Heating 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: A. B. C. D. Conduction Convection Radiation Evaporation Physics and Astronomy Outreach Program at the University of British Columbia

Question 3 Answer Home Heating 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: A. Conduction B. Convection C. Radiation D. Evaporation Physics and Astronomy Outreach Program at the University of British Columbia

Question 3 Solution Home Heating 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

Question 4 Home Heating A k. Wh in B. C. costs currently ~ 7. 0 cents. The total energy consumption in a 1000 ft 2 (~100 m 2) large apartment is approximately 200 MJ per day. If the apartment is heated electrically, what’s the energy cost each month? A. B. C. D. E. Less than $ 25 $ 50 $ 100 More than $ 100 Physics and Astronomy Outreach Program at the University of British Columbia

Question 4 Answer Home Heating A k. Wh in B. C. costs currently ~ 7. 0 cents. The total energy consumption in a 1000 ft 2 (~100 m 2) large apartment is approximately 200 MJ per day. If the apartment is heated electrically, what’s the energy cost each month? A. B. C. D. E. Less than $ 25 $ 50 $ 100 More than $ 100 Physics and Astronomy Outreach Program at the University of British Columbia

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