Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 221 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
2. 2.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
3. 3.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points right (b) points left (c) points up and left (d) points up and right
5. 5.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
6. 6.🦾 A servo moves from 70° to 150°. How many degrees does it turn?
7. 7.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
8. 8.🦾 A servo moves from 110° to 90°. How many degrees does it turn?
9. 9.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
13. 13.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
14. 14.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
15. 15.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
16. 16.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
17. 17.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
19. 19.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and left (b) points straight up (c) points up and right (d) points left
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
21. 21.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
24. 24.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 50
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
26. 26.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
27. 27.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
29. 29.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points right (b) points up and right (c) points straight up (d) points left
30. 30.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
33. 33.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
35. 35.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
38. 38.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
40. 40.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor

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