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Assignment #7 Part I - Car Circuit (10 Marks) Built into almost every car is a simple circuit that alerts the driver by “Buzzing” when the the door is opened and the key is in the ignition. The car will also buzz, when the car is in drive and the driver has not buckled the seatbelt. Design a circuit that consists of the following components: AND Gates OR Gate NOT Gate Buzzer 4 Switches (one for each input (hint: bold letters)) a) Sketch the circuit. Use MS paint or pen and paper. Label each switch. (5 Marks) b) Do a truth table for this circuit. (3 Mark) c)Write the Formula. (2 Marks) Part II - Ohm’s Law (20 Marks) The Relationship of Voltage, Current, and Resistance is governed by this equation V=IxR where: V = voltage in volts (V) I = current in amps (A) R = resistance in ohms or: V = voltage in volts (V) I = current in milliamps (mA) R = resistance in kilohms (k) 1. Read more about voltage and current on this page: http://www.kpsec.freeuk.com/voltage.htm#seriesparallel 2. Run the tutorial on this page: http://www.wisc-online.com/objects/index_tj.asp?objID=DCE8104 3. Try the simulator: http://phet.colorado.edu/simulations/veqir/VeqIRColored.swf Example Problem: A nine volt battery supplies power to a cordless curling iron with a resistance of 18 ohms. How much current is flowing through the curling iron? Solution V=IxR 9 = I X 18 I = 9/18 I = 0.5 Amps Therefore, 0.5 Amps is flowing through the curling Iron. Par II : Questions: (20 Marks) Research Ohm’s Law and answer the following questions. 1. The rate of electron flow is measured in (a) amperes (b) volts (c) ohms. 2. In a circuit, voltage and current are (a) directly proportional, (b) inversely proportional, (c) not proportional. 3. According to Ohm’s Law, what effect will cutting the resistance have on the current? 4. If the voltage stays the same and the resistance is ¼ of its original, what will happen to the current? 5. Using your equation for Ohm’s Law, answer the following. Current equals __________ divided by _____________. 6. If the power source is set at 6V and R is 2 ohms, the current =___________ 7. V=5volts, R= 10 ohms, I= ____________. 8. Voltage = ____________ times_____________. 9. If the current in the circuit is 7 amps and the resistance is 2 ohms the voltage =___________. 10. R = 30 ohms, I = 3A, V=__________ 11. Resistance= ______________ divided by _____________. 12. If the power source is 12 V and the flow of electrons is 3A, what is the resistance? 13. V= 6V, I= 18A, R=__________ 14. A 110 volt wall outlet supplies power to a strobe light with a resistance of 2200 ohms. How much current is flowing through the strobe light? 15. A CD Player with a resistance of 40 ohms has a current of 0.1 amps flowing through it. How many volts supplies the CD player? 16. Complete the following chart (4 marks) Part III Calculate the Resistance needed to safely operate the LED in this diagram (10 marks) Part IV Using MS Paint, complete the following Ohm’s Law Calculator. Use a different background color for each section (light colors). Search Google images for “Ohm's wheel” to research. Print and submit. (10 marks) Ohm’s Law

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