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Transcript
Name_________________________________________ Date_________ House____________________ Class________ U5. L5. Simple Circuits GP/IP SHOW ALL WORK USING GUESS. No GUESS, no credit. Box final answers and write them in a sentence. Examples 1. A 12 V battery causes a 3 amp current through a light bulb. a. What is the resistance of the light bulb? b. How much power does it draw? 2. A light bulb in a circuit with a 12 V battery uses 24 watts. What is the resistance of the light bulb? 3. In a circuit, what happens to the current if the voltage is tripled and the resistance remains the same? GUIDED PRACTICE 1. A hair dryer draws 3.5 A of current when connected to an outlet with a potential difference of 120 V. What is the resistance of the hair dryer? (Answer: The resistance of the hair dryer is 34.29 ohms.) Created by M. Kelly OBJECTS IN MOTION STAY IN MOTION! 2. If your cell phone has a 3.7 V battery uses 17 watts while playing Clash of Clans. What is the resistance inside your phone? (Answer: The resistance of the phone is 0.81 ohms.) 3. In a circuit, what happen to the current if the resistance of the circuit is tripled? (Answer: The new current is one third of the original current; 1/3 I) 4. In a circuit, if the voltage is doubled and the resistance is quadrupled, what will happen to the current in the circuit? (Answer: The new current is ½ of the original current; ½ I) INDEPENDENT PRACTICE 1. A light bulb with a resistance of 160 is plugged into a 120-V outlet. What is the current flowing through the bulb? 2. An iPhone requires 1.5 A of current and has a power of 15 watts. What is the voltage of the rechargeable battery it uses? 3. In a circuit, what happens to the power if the voltage is doubled and the resistance remains the same? Created by M. Kelly OBJECTS IN MOTION STAY IN MOTION! 4. In a circuit, what happens to the power if the resistance is decreased by half and the voltage remains the same? 5. A TV draws 3 amps of current and requires 100 W of power. What is the resistance of the TV? 6. Can a 1.5V battery provide enough current to keep a phone with 0.3 ohms of resistance working if it needs at least 1 amp of current to function? 7. In a circuit, what happens to voltage if the current is triple and the resistance is doubled? 8. In a circuit, what happens to voltage if the current is triple and the resistance is cut in half? 9. In a circuit, what happens to current if the power is doubled and the voltage is cut in half? 10. A 140 is used and has a current of 1.3 A flowing through it. What power does it create? Created by M. Kelly OBJECTS IN MOTION STAY IN MOTION!