Robotics: Classroom Activities | Robotics at Foothill High School: Activities

Activity #5: Calculating Power

At the beginning of the gear activity section, we discussed the mathematical formula for torque ( t = rF ). In this activity, we will introduce additional variables for distance of a circle and revolutions per second. A tangential force at a crank radius of r will move through a distance of 2 x r each time the shaft makes one complete revolution. This movement creates a certain amount of work as described as:

W = F x 2 x r

Adding the torque equation to the work equation, we come up with:

W = 2 x t

This can then be transferred to the power equation which is:

P = 2 x t x f

Where f is equal to the motor's speed in revolutions per second.

Materials:
pencil and paper, calculator

Procedure:
Calculate the power supplied by a motor running at 3400 rpm while delivering a torque of 800 foot lbs.

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