QR Challenge: Chapter 6 Electricity Study Guide ANSWERS

Created using the ClassTools QR Treasure Hunt Generator

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

• Download a QR reader (e.g. I-Nigma | NeoReader | Kaywa) onto their mobile devices
• Bring these devices into the lesson.

3. Print out the QR codes.

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

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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!

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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.

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Questions / Answers (teacher reference)

Question	Answer
1. a is opposite and b is like charges	What type of electric charges a. attract each other? b. repel each other?
2. charging by friction	How do clothes in a dryer acquire static cling?
3. electrically neutral	What charge do you have after acquiring a positive charge from walking across a carpet then touching a doorknob and receiving a shock?
4. The Law of Conservation of Charge	What states charges are not created or destroyed?
5. static discharge	What is the loss of static electricity as electric charges move off an object?
6. static electricity	What is the buildup of charges on an object?
7. electroscope	What is an instrument that can detect the presence of an electric charge?
8. electric circuit	What is a complete, unbroken path through which electric charges can flow?
9. conductors	What materials allow the charges of an electric current to move freely through them?
10. wood, plastic, and glass	List 3 examples of insulators.
11. ampere/volt/ohm	What is the unit for electric current? voltage? resistance?
12. terminals	What parts of the cell are used to connect an electrochemical cell to a circuit?
13. electrochemical cell/battery	What is a device that transforms stored chemical energy into electrical energy?
14. resistance is equal to voltage divided by current	What is Ohm's law?
15. voltmeter	What is a device used to measure electrical potential energy difference, or voltage?
16. switch	What is a device used to open and close and electric circuit?
17. voltage x current	How do you calculate power?
18. see page 186	Draw a parallel circuit with a switch and label it.
19. see page 185	Draw a series circuit with a switch and label it.
20. electrically grounded	What is a circuit if it can carry electric current from a short circuit directly to Earth?
21. static discharge lasts for only a fraction of a second	How is static discharge different from a electric current?
22. electrical power	What is the rate at which an electrical device converts energy from one form to another?
23. R=V/I	What is the relationship between current, resistance, and voltage difference?
24. A very large discharge of static electricity due to charges in the clouds separating to positive on top and negative on bottom causing the Earth's surface to become charged.	What is lightning?
25. circuit breaker	What is a device designed to open an overloaded circuit and prevent overheating?
26. decreases	What happens to resistance as more branches are added to a parallel circuit?
27. 180 kWh	If an electric water heater uses 60 kW of power and runs for 3 hours, what is the total amount of energy used?
28. 36 watts	If a household’s voltage is 120 volts, what is the power rating of a light bulb with 0.3 amps of current flowing through it?
29. 4 ohms	What is the resistance for a current of 2 amps and a voltage of 8 volts?
30. .1 amps	What is the current produced with a 6-volt battery through a resistance of 60 ohms?
31. 1200 volts	What voltage produces a current of 40 amps with a resistance of 30 ohms?

 

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