Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 125 · 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 arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points right (b) points up and left (c) points up and right (d) points left
2. 2.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
4. 4.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
6. 6.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and left (b) points right (c) points left (d) points up and right
7. 7.🦾 A servo moves from 40° to 170°. How many degrees does it turn?
8. 8.🦾 A servo program runs:
   angle = 0
   angle = angle + 60
   angle = angle − 40
   angle = angle + 60
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
10. 10.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
11. 11.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
12. 12.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
14. 14.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
15. 15.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
16. 16.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
17. 17.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
19. 19.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
22. 22.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 50
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 30° to 120°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo moves from 0° to 70°. How many degrees does it turn?
26. 26.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
30. 30.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo program runs:
    angle = 60
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
34. 34.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
37. 37.🦾 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 up and right (c) points right (d) points straight up
38. 38.🦾 A servo moves from 70° to 180°. How many degrees does it turn?
39. 39.🦾 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 straight up (b) points right (c) points up and left (d) points left
40. 40.🦾 A servo moves from 160° to 20°. How many degrees does it turn?

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