Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 61 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
2. 2.🦾 A servo program runs:
   angle = 40
   angle = angle + 20
   angle = angle − 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
3. 3.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
5. 5.🦾 A servo program runs:
   angle = 170
   angle = angle − 40
   angle = angle − 60
   angle = angle − 50
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
7. 7.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo program runs:
   angle = 50
   angle = angle + 10
   angle = angle − 30
   angle = angle − 10
   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.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
13. 13.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
18. 18.🦾 A servo moves from 0° to 160°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
20. 20.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
22. 22.🦾 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 left (b) points straight up (c) points up and left (d) points right
23. 23.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
24. 24.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 40
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 160° to 150°. How many degrees does it turn?
27. 27.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
29. 29.🦾 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 right (b) points up and left (c) points straight up (d) points right
30. 30.🦾 A servo moves from 120° to 150°. How many degrees does it turn?
31. 31.🦾 A servo moves from 10° to 80°. How many degrees does it turn?
32. 32.🦾 A servo moves from 180° to 120°. How many degrees does it turn?
33. 33.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
34. 34.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 50
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 30
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
38. 38.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 100
    angle = angle + 10
    angle = angle − 30
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 20
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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