Physics Circuits. Day 1. QQ5. A charge of 45 C passes through a 12-ohm resistor in 5 seconds. What is the current?
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1 Homework Procedure: Read pages specified in Honors Physics Essentials by Dan Fullerton. Questions labeled TQ will be questions about the text you read. These TQ s can be answered in one word, one phrase, or a complete sentence. Questions labeled CQ are conceptual questions and must be answered in complete sentences. Questions labeled QQ s are quantitative questions and the equation, substitution with units, and solve with units must be shown on your paper. CQ s and QQ s will be similar to the questions found in the Honors Physics Essentials textbook. Read Page 234 (Electric Current) TQ1. What is electric current? TQ2. What is the symbol for electric current? TQ3. What are the units of electric current? Day 1 TQ4. What is the equation for calculating electric current? QQ5. A charge of 45 C passes through a 12-ohm resistor in 5 seconds. What is the current? QQ6. There are 7.50 x electrons passing through a circuit in 60 seconds. What is the current running through this circuit? QQ7. The current in a lightbulb is 4.0 A. How much charge in Coulombs passes through this lightbulb in two minutes? QQ8. How many electrons pass through the lightbulb in QQ7? Read Page 236 (Resistance) TQ9. What two things will change the conductivity of a substance? TQ10. What is resistance? TQ11. What it the equation to calculate the resistance of an object? TQ12. What are the units of resistance (not resitivity!)? CQ13. Which graph best represents the relationship between the resistance of an object and its length? CQ14. Which graph above best represents the relationship between the resistance of an object and its area?
2 Day 2 Read Page 238 (Ohm s Law) TQ19. Finish the equation for Ohm s Law. V = (For CQ20 CQ22 refer to the graphs on CQ13) CQ20. Which graph best represents the relationship between voltage (potential difference) and current? CQ21. Which graph best represents the relationship between voltage (potential difference) and resistance? CQ22. Which graph best represents the relationship between current and resistance? QQ23. A small flashlight bulb draws 0.30 A from its 1.5 V battery. What is the resistance of the bulb? QQ24. If another flashlight bulb uses 1.2 V of battery and has a resistance of 8.0 Ω, what is the current? QQ25. If a speaker that draws 4.0 A has a wire with a resistance of 0.10 Ω, what is the voltage across the wire? Read Page 242 (Power) TQ22. What is the equation for electrical power with voltage (potential difference) and current? QQ23. If a 120 V hairdryer draws 15 A, what is the power rating of the hairdryer? QQ24. If an appliance operating at 120 V draws 12 A of current, how much heat is delivered in one minute?
3 Day 3 Read Page 241 (Electrical Circuits) TQ31. Label each one of the circuit symbols below. Read Page 244 (Voltmeters and Ammeters) TQ32. Voltmeters, which measure potential difference or voltage, need to be connected in. TQ33. Due to your answer in TQ32, must stay the same when connected in. TQ34. Ammeters, which measure the current in a circuit, need to be connected in. TQ35. Due to your answer in TQ34, the must stay the same when connected in. CQ36. Fill in the circles below with either a V for Voltmeter or an A for Ammeter.
4 Day 4 Read Page 246 (Series Circuits) Refer to CQ37 QQ39 for the following circuit diagram CQ37. A 4.0 Ω resistor and a 6.0 Ω resistor are connected in series in a circuit as shown above. The current through the 4.0 Ω resistor is 5.0 A, what is the current running through the 6.0 Ω resistor? QQ38. What is the equivalent resistance of the circuit? QQ39. What is the voltage or potential difference of the circuit? CQ40. What is the reading on Ammeter A shown below? QQ41. Fill out the VIRP table for the following circuit. V I R P R 1 R 2 Total 120 V 10 Ω 20 Ω
5 Read Page 252 (Parallel Circuits) Refer to CQ42 QQ43 for the following circuit diagram CQ42. If the voltage in the battery is 60 V, what is the voltage for the 20 Ω resistor and the 30 Ω resistor connected in parallel? QQ43. What is the current of the 20 Ω resistor and the 30 Ω resistor given the voltage on each in CQ42? QQ44. Fill out the VIRP table for the following circuit. V I R P R 1 R 2 Total 24 V 4 Ω 12 Ω
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