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Homework Help: How would you solve the following cuircut problem?

  1. Jun 5, 2017 #1
    1. The problem statement, all variables and given/known data
    You are tasked with designing an electrical circuit with a motor, a battery, and several 1ohm and 2ohm resistors. The motor is designed to run at a current of 20A and a voltage of 10V, but your battery supplies 15 V. The motor can then lift a 4kg mass 2.25 meters in 0.5seconds.

    A.) Draw a circuit diagram of how to hook up the motor with resistors so that the motor gets the appropriate voltage.
    B.) Determine the electrical input to the motor over the course of 100 seconds, both in Joules and kWh.
    C.) Determine the power output of the motor lifting the mass.
    D.) Determine the efficiency of the motor lifting the mass.
  2. jcsd
  3. Jun 5, 2017 #2


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    Staff: Mentor

    Hi Wendy,

    Welcome to Physics Forums!

    Our rules require that you show what you've tried before help can be offered. That's the reason for the other two sections of the formatting template which you deleted.

    What formulas have you found in your class notes or textbook that might be applicable to this type of problem? Have you sketched a circuit diagram? What might be the function of any resistors you use in it?
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