Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 517 · 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.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
3. 3.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
4. 4.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
6. 6.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
7. 7.🦾 A servo moves from 150° to 110°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo program runs:
   angle = 100
   angle = angle + 50
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
11. 11.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
13. 13.🦾 A servo moves from 160° to 170°. How many degrees does it turn?
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
15. 15.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 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 up and right (c) points left (d) points straight up
19. 19.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
20. 20.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
22. 22.🦾 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 straight up (b) points left (c) points right (d) points up and left
23. 23.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
25. 25.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
29. 29.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
30. 30.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
31. 31.🦾 A servo moves from 0° to 10°. How many degrees does it turn?
32. 32.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo moves from 170° to 100°. How many degrees does it turn?
34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
36. 36.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
37. 37.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
38. 38.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
40. 40.True or false: “has just two wires” is true of a DC motor. (a) True (b) False

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