In this experiment, we want to measure motor power.

Materials: 1 DC Motor, 1 Power supply, four 1 ohm resistor with at least two-watt power, 1 application for measuring frequency (I suggest "Spectroid" for android and "Spachinger Schallanalysator" for IOS users), 1 spring weighing scale

Task:

By connecting power supply positive to the motor positive pole and negative to negative, you can run the motor. Make a simple circuit in this way. Remember the instructions from the video while conducting the experiments.
Now you can measure no-load current and voltage. Then by using the Spectroid app, you can measure the frequency of the motor and according to the instructions in the introduction video, you can find the motor rotational speed.

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3. To see the impact of resistors on the motor current, you can make a serial circuit between the motor and one of your resistors. Then you can read the current with power supply.

4. To see the impact of parallel resistors, you can put the resistors in a parallel position and put them in a serial configuration with the motor. Then you can read the current with power supply and compare it with the previous values for current.

5. To measure the stall torque of the motor, you can install a beam with a spring weighing scale, and by multiplying the measured force and beam length you will find the torque.

6. Now you have motor stall torque and motor no-load speed. By using the middle point of the graph you will find the motor maximum power.

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