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Transcript
Name: ______________________________ ___________________________________ Activity 1: Electricity Worksheet A. Where are electrons located in an atom? ________________ B. What charge does an electron have? _________________ C. What two things are located in the center of an atom? ___________________ _____________________ D. What keeps the electrons orbiting around nucleus? _________________ E. What is the name of the force that causes electrons to move away from the nucleus? ____________________ F. When a switch in a circuit is open (turned off), what are the Free Electrons doing? ____________________________________________________ G. Once the switch is closed (turned on), the positive attraction causes the __________ to flow. H. What is electricity? ___________________________________________ I. Materials that allow the flow of electrons from negative to positive are called _____? J. List 3 good conductors. ____________ _____________ ___________ K. What is the most common metal used in wires? ____________________ L. Why not use gold as wire since it’s free electron is farther away from the nucleus than copper? (Think!) ________________________________ M. Safety Warning: What three problems can happen when you when you connect a short wire between the positive and negative ends of a battery? ___________________ ___________________ _________________ N. Why isn’t it a safety issue when to connect a short wire with a light in the circuit? (2 reasons) __________________________________________ ___________________________________________________________ O. The plastic on a wire is called an ___________. 1 Name: ______________________________ ___________________________________ Activity 2: Electrical Safety Worksheet Write in the Electrical Safety tip and the reason represented by each picture. 1. Tip: Reason: 2. Tip: Reason: 3. Tip: Reason: 2 Name: ______________________________ 4. ___________________________________ Tip: Reason: 5. Tip: Reason: 6. Tip: Reason: 3 Name: ______________________________ 7. ___________________________________ Tip: Reason: 8. Tip: Reason: 9. Tip: Reason: 10. Tip: Reason: 4 Name: ______________________________ 11. ___________________________________ Tip: Reason: 12. Tip: Reason: 13. Tip: Reason: 14. Tip: Reason: 5 Name: ______________________________ 15. ___________________________________ Tip: Reason: 16. Tip: Reason: 17. Tip: Reason: 18. Tip: Reason: 6 Name: ______________________________ ___________________________________ Activity 3: Types of Electrical Outlets The home depot provides information about the different types of electrical outlets available. Aren’t they all the same? No, the electrical code requires certain outlets for different functions. It’s all about safety!! Link 1. Name: Function: 2. Name: Tamper Resistant Function: 3. Name: Function: 4. Name: Function: 7 Name: ______________________________ 5. ___________________________________ Name: Function: 6. Name: Function: NONE! Why? 7. Name: Split Circuit (just about any outlet can be a Split Circuit – just pry off the metal tabs) Function: 8 Name: ______________________________ ___________________________________ Activity 4: Conductivity Lab Worksheet 1. Where do you plug the black probe into the multi-meter? 2. Set the multi-meter on DC current and record the voltage in the batteries provided by the teacher: a. AA batteries: _____________ b. “C” battery: _____________ c. “Coin” cell: _____________ d. Rechargeable: _____________ e. Transformer 1: _____________ f. Transformer 2: _____________ 3. Change your meter to AC, AND SHOW IT TO YOUR TEACHER, before you test a couple of wall outlets. a. Outlet 1: _____________ b. Outlet 2: _____________ 4. Using the textbook (p. ), sketch a diagram showing where you have to put the probes to measure current (amps). 9 Name: ______________________________ ___________________________________ 5. Change your meter to measure Resistance. Test 10 items in the classroom and determine if they conduct electricity. Fill in the chart. Note: the meter only sends out a weak electrical current so anything that is covered in paint, might not register. Scratch the paint away and try again. Meter Reading Item 6. Use the Resistance setting on the meter to measure: Meter Reading Item Light bulb A electronics resistor A stove element An LED 10 Does it conduct? Name: ______________________________ ___________________________________ 7. Complete the chart: Symbol Name Unit Explanation A 8. Using the Red Textbook (pages: ): a. Explain the terms conductor and insulator b. List 5 materials that make good conductors. c. List 5 materials that make good insulators. 11 Name: ______________________________ ___________________________________ Activity 5: Wire and Cable 1. What does all the writing on the wire mean? Use the “Reading Wire Information” page and indicate the words on the wire and explain what they mean for each category: Info On Wire: What it means: a. Type: ____________ ___________________________ b. Materials: ____________ ___________________________ c. Voltage Rating: ____________ ___________________________ d. Gauge: ____________ ___________________________ e. Number of Wires ____________ ___________________________ f. Certified: ___________________________ ____________ 2. These questions are from the “Circuit Wiring” information page. a. What is a circuit? _______________________________________ ______________________________________________________ b. What are the three components of every circuit in residential wiring? ________________ _________________ _________________ c. What is the function of a circuit breaker? _____________________ ______________________________________________________ d. What causes a circuit breaker to trip/reset? ___________________ e. Which circuit can run the most power hungry devices, 15 amp, or 20 amp? _______________ 12 Name: ______________________________ ___________________________________ f. Name an example of something might need a 20 amp circuit? _________________ g. What would you do to find out if a circuit was 15 amps or 20 amps? ______________________________________________________ 3. The “Canadian Electrical Code Book” information page specifies the requirements for each situation: a. How many outlets can you have on a circuit around a kitchen counter? _________ b. What electrical requirements are there when you build an Island (a counter in the middle of the kitchen floor)? __________________ ____________________________________________________ c. What are the exact specifications for putting GFI outlets in a bathroom? ___________________________________________ d. In a new home, you must have smoke detectors. What specifically is the requirement? _________________________________________ e. Name 3 devices that require their own circuit because they draw a lot of electrical current. ____________ _____________ ___________ f. What color wire would you use for bedroom outlets? ____________ 13 Name: ______________________________ ___________________________________ 4. Use the “Joining Wire” information page to answer these questions: a. What is the purpose of “junction boxes”? _____________________ ______________________________________________________ b. What can you put over a joint to provide some insulation from shock? ___________________________ c. What is the standard for removing sheathing and insulation to create a joint? ________________________________________________ Activity 7: Use a pencil to represent the location and connections of the white wire. Do the same with a pen to show the black wire. (We’ll leave the ground wire out of the diagram) 14