Resistor help

Discussion in 'The Projects Forum' started by RonnieSaha, Aug 10, 2014.

  1. RonnieSaha

    Thread Starter New Member

    Aug 8, 2014
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    My question is this - Do I need a resistor in a circuit with a 9v battery connected to a 3.7v 200mA Motor because when I tried it without a resistor it got hot very quickly? In another thread a member said that I do not need a resistor for it as the motor will do it itself? Does this mean that I should change the voltage instead of current?

    Thanks. (I am very new to this so my question will seem simple to many of you I imagine so please bear that in mind when explaining it to me!):D
     
  2. Polymorphism

    New Member

    Aug 10, 2014
    30
    2
    The voltage is the force and the current is the food for the circuit. Consider the following ...

    A tap with running water. The pressure behind the water is the voltage and the actual water is the current.

    You do not want an resistor for your motor to drop the current. What you want is either an
    9 volt motor or an PWM circuit to control your existing motor.
     
  3. tracecom

    AAC Fanatic!

    Apr 16, 2010
    3,869
    1,393
    Yes, the supply voltage needs to match the motor voltage. You could change the battery from a 9V to a pair of 1.5V AA, AAA, C, or D cells in series, all of which wold give much longer life than the 9V.
     
  4. RonnieSaha

    Thread Starter New Member

    Aug 8, 2014
    7
    0
    Thanks for the help!:) How would I wire a PWM into the circuit as it has 3 pins - I presume 2 will be for +/- but what will the other be connected to?
     
  5. RonnieSaha

    Thread Starter New Member

    Aug 8, 2014
    7
    0
  6. Polymorphism

    New Member

    Aug 10, 2014
    30
    2
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