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QR Challenge: Energy, Power and Time

Created using the ClassTools QR Treasure Hunt Generator

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Teacher Notes

A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

3. Print out the QR codes.

4. Cut them out and place them around your class / school.

B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

Questions / Answers (teacher reference)

Question

Answer

1. A hairdryer has a power rating of 100W. It is used for 300s. How much energy is transferred?3000J
2. A TV is on for 500s and has a power rating of 2000W. How much energy does it use?1,000,000J
3. If a laptop transfers 3000J of energy when it is on for 60s, what is the power rating?50W
4. If, when left on for 800s, an appliance uses 40,000J of energy. What is the power rating?50W
5. A phone has a power rating of 70W, it transfers 140,000J of energy. How long was it on for?2000s
6. An electric heater transfers 50,000J of energy and has a power rating of 100W. How long was it on for?500s
7. An ipod transfers 5KJ of energy in 250s, what is the power rating?20W
8. A hover board transfers 64KJ of energy and has a power rating of 80W, how long was it on for?800s
9. Some hair straighteners have a power rating of 16KW, if they are used for 600s, how much energy do they transfer?9,600,000J
10. An Xbox has a power rating of 0.5KW, if it is used for 3000s, how much energy is transferred?1,500,000J
11. A TV is left on for 30minutes, if the power rating is 350W. How much energy is transferred? 630,000J
12. A lamp is left on for 15 minutes, if the power rating is 12W. How much energy is transferred?10,800J
13. How much energy (in KWh) is transferred by an appliance if the power rating is 400KW and the appliance is on for 3hours?1200KWh
14. How much energy (in KWh) is used by a radio with a power rating of 20KW, when it is on for 16hours?320KWh
15. If a TV uses 900KWh of energy and energy costs 12p per KWh. How much did the TV cost to run?10,800p
16. If a phone charger has a power rating of 4KW, how much does it cost to run for 0.5 hours. If energy costs 13p per KWh? 26p

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=A_hairdryer_has_a_power_rating_of_100W._It_is_used_for_300s._How_much_energy_is_transferred?

Question 1 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=A_TV_is_on_for_500s_and_has_a_power_rating_of_2000W._How_much_energy_does_it_use?

Question 2 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=If_a_laptop_transfers_3000J_of_energy_when_it_is_on_for_60s,_what_is_the_power_rating?

Question 3 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=If,_when_left_on_for_800s,_an_appliance_uses_40,000J_of_energy._What_is_the_power_rating?

Question 4 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=A_phone_has_a_power_rating_of_70W,_it_transfers_140,000J_of_energy._How_long_was_it_on_for?

Question 5 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=An_electric_heater_transfers_50,000J_of_energy_and_has_a_power_rating_of_100W._How_long_was_it_on_for?

Question 6 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=An_ipod_transfers_5KJ_of_energy_in_250s,_what_is_the_power_rating?

Question 7 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=A_hover_board_transfers_64KJ_of_energy_and_has_a_power_rating_of_80W,_how_long_was_it_on_for?

Question 8 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=Some_hair_straighteners_have_a_power_rating_of_16KW,_if_they_are_used_for_600s,_how_much_energy_do_they_transfer?

Question 9 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=An_Xbox_has_a_power_rating_of_0.5KW,_if_it_is_used_for_3000s,_how_much_energy_is_transferred?

Question 10 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=A_TV_is_left_on_for_30minutes,_if_the_power_rating_is_350W._How_much_energy_is_transferred?

Question 11 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=A_lamp_is_left_on_for_15_minutes,_if_the_power_rating_is_12W._How_much_energy_is_transferred?

Question 12 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=How_much_energy_(in_KWh)_is_transferred_by_an_appliance_if_the_power_rating_is_400KW_and_the_appliance_is_on_for_3hours?

Question 13 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=How_much_energy_(in_KWh)_is_used_by_a_radio_with_a_power_rating_of_20KW,_when_it_is_on_for_16hours?

Question 14 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=If_a_TV_uses_900KWh_of_energy_and_energy_costs_12p_per_KWh._How_much_did_the_TV_cost_to_run?

Question 15 (of 16)

 


Energy, Power and Time: QR Challenge

https://www.classtools.net/QR/decode.php?text=If_a_phone_charger_has_a_power_rating_of_4KW,_how_much_does_it_cost_to_run_for_0.5_hours._If_energy_costs_13p_per_KWh?

Question 16 (of 16)