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SNC 1D PhET worksheet on electricity Name: _____________________ Instructions: Search through any internet application for “PhET”. The first hit should be “PhET simulations from the University of Colorodo”. Open the “simulation” part of the site and click on the physics link in the left margin. Simulation 1- Electric Field Hockey Scroll down until you see the above link. Open the Electric Field hockey and RUN the Java application. Click on the trace and field options and once you have arrange some charges, hit start and see if you scored. How many trials did you run before you scored? ____________ Was the Law of Electric Charges verified by the application? What do you think is an Electric Field? Simulation #2 - Circuit Construction Kit (AC + DC) 1 SNC 1D PhET worksheet on electricity Name:_____________________ Open the link and run the application. The 4 requirements for any circuit are a power source – the _______________, a load – the light bulb, a mechanism to create a conductive path – the __________ and a complete loop. ( wire, battery) Step 1. Create a simple circuit – 1 battery, 1 light bulb, wire and a complete loop. a) Remove the battery by “right clicking on the icon” and reconnect the wire. What happens in the circuit? b) Return the battery but remove the light bulb. Reconnect the wire. What happens in the circuit and why? c) Return the light bulb and flip the battery. What happens to the charge flow? d) Replace the battery with the AC icon. What do you think AC stands for? e) Return the battery, removing the AC icon. “Right click” on the battery and change its voltage. How does the energy in the circuit relate to the voltage? f) “Right click” on the light bulb and change its resistance. What do notice about the light intensity? g) Select the Voltmeter in the right margin. Determine the voltage of the battery by touching the wire on either side of the battery. ( V = __________.) Determine the voltage across the light bulb by touching the wire on either side of the light bulb. V = __________. Voltage represents the energy per charge carrier. What conclusion can you draw about the energy provided by the battery and the energy spent at the load? h) What happens if you touch the wire at two spots near each other such that there is no load or battery between the two tips? What does this tell you about the energy spent in the wire? i) Add a second battery to the circuit such that it is connected to one end of the existing battery. Does it matter which way you connect the battery? Write a brief paragraph outlining what you learned about simple circuits. 2 SNC 1D PhET worksheet on electricity Step 2 – A series circuit A circuit is considered a series circuit if it has more than one load but the charge only has one path from one end of the battery to another. Construct a series circuit with 2 light bulbs and 1 battery ( and wire of course) a) Using the voltmeter measure the voltage across the battery and each load. Battery _________ Light bulb 1 _______ Light bulb 2 _________ b) Using the non contact ammeter, measure the current at various spots in the circuit and record the results a. Spot 1 _______ Spot 2 _______ Spot 2 _______ c) With the circuit running, right click on one terminal on one of the light bulbs and split the junction. What happens to the circuit? d) Reattach the wire to the light bulb. Right click on one of the light bulbs and change its resistance. Record the new voltages and the current with this new circuit. Battery _________ Light bulb 1 _______ Light bulb 2 _________ Spot 1 _______ Spot 2 _______ Spot 2 _______ e) Add two switches to the circuit and indicate their effect on the circuit. Do both switches have to be closed? Explain. 3 SNC 1D PhET worksheet on electricity Step 3 – A parallel circuit A circuit is considered a parallel circuit if the charges have more than one path to travel from one end of the battery to another. The circuit can be made rectangular such that the different paths appear parallel but this rarely happens in the real world. Construct a parallel circuit with one battery and 2 light bulbs f) Using the voltmeter measure the voltage across the battery and each load. Battery _________ Light bulb 1 _______ Light bulb 2 _________ g) Using the non contact ammeter, measure the current at various spots in the circuit and record the results a. Spot 1 _______ Spot 2 _______ Spot 2 _______ h) With the circuit running, right click on one terminal on one of the light bulbs and split the junction. What happens to the circuit? i) Reattach the wire to the light bulb. Right click on one of the light bulbs and change its resistance. Record the new voltages and the current with this new circuit. Battery _________ Light bulb 1 _______ Light bulb 2 _________ Spot 1 _______ Spot 2 _______ Spot 2 _______ j) Add two switches to the circuit and indicate their effect on the circuit. Do both switches have to be closed? Explain. 4