Unit 8 Quiz #3 Targets 7-8

10 Questions | Total Attempts: 347

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Unit 8 Quiz #3 Targets 7-8 - Quiz

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Questions and Answers
  • 1. 
    A total charge of 76 C passes through a cross-sectional area of a copper wire in 19 s. What is the current in the wire?
    • A. 

      4

    • B. 

      4 W

    • C. 

      4 A

    • D. 

      4 V

  • 2. 
    A total charge of 114 uC passes through a cross-sectional area of an aluminum wire in 0.36 s. What is the current in the wire?
    • A. 

      41.04 A

    • B. 

      316.67 A

    • C. 

      4.104 x 10^-5 A

    • D. 

      3.17 x 10^-4 A

  • 3. 
    Electric eels, found in South America, can provide a potential difference of 440 V that draws a current of 0.80 A through the eel’s prey. Calculate the resistance of the circuit (the eel and prey).
    • A. 

      550 Ohm

    • B. 

      0.002 Ohm

    • C. 

      352 Ohm

    • D. 

      55 Ohm

  • 4. 
    It is claimed that a certain camcorder battery can provide a potential difference of 9.60 V and a current of 1.50 A. What is the resistance through which the battery must be discharged?
    • A. 

      14.4 Ohm

    • B. 

      6.4 Ohm

    • C. 

      0.16 Ohm

    • D. 

      11.1 Ohm

  • 5. 
    You have probably heard that high-voltages are more dangerous than low voltages. To understand this, assume that your body has a resistance of 1.0 x 105 Ohm. What potential difference would have to be across your body to produce a current of 1.0 mA (which would cause a tingling feeling) and 15 mA (a fatal amount of current)?
    • A. 

      1 x 10^8 V and 6.67 x 10^6 V

    • B. 

      1 x 10^5 V and 6666.67 V

    • C. 

      100 V and 1500 V

    • D. 

      1 x 10^5 V and 1.5 x 10^6 V

  • 6. 
    A generator at a central electric power plant produces electricity with a potential difference of 2.5 x 104 V across power lines which carry a current of 20.0 A. How much power does the generator produce?
    • A. 

      1250 W

    • B. 

      8 x 10^-4 W

    • C. 

      500,000 W

    • D. 

      1 x 10^7 W

  • 7. 
    An electric sports car was developed several years ago at Texas A&M University in College Station, Texas. If the potential difference across the car’s motor is 720 V and the resistance was 0.30 Ohm, how much power was needed for the car to run?
    • A. 

      1.73 x 10^6 W

    • B. 

      216 W

    • C. 

      64.8 W

    • D. 

      2400 W

  • 8. 
    Suppose that you’ve just returned to work from your lunch hour. When you reach your desk, you realize that you had forgotten to turn off your computer. Fortunately, your computer was in its energy-conserving “sleep” mode. What is the power of a computer which consumed 2.7 x 108 J of energy?
    • A. 

      2.7 x 10^8 W

    • B. 

      9.72 x 10^11 W

    • C. 

      75,000 W

    • D. 

      2.62 x 10^20 W

  • 9. 
    Suppose you’ve just returned to the parking lot from a 3.0 h shopping spree at the mall and realized that you had forgotten to turn off the headlights to your car. If 4.86 x 108 J of energy was spent, what is the power of the headlights?
    • A. 

      450,000 W

    • B. 

      1.62 x 10^8 W

    • C. 

      1.46 x 10^9 W

    • D. 

      4.5 x 10^4 W

  • 10. 
    A total charge of 76 C passes through a cross-sectional area of a copper wire in 19 s. What is the current in the wire?
    • A. 

      4 A

    • B. 

      4 W

    • C. 

      1444 A

    • D. 

      1444 W

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