Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 468 · 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 drives the wheels? (a) a servo motor (b) a DC motor
2. 2.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
3. 3.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
4. 4.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
5. 5.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
8. 8.🦾 A servo program runs:
   angle = 140
   angle = angle − 20
   angle = angle + 50
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
10. 10.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 10
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
14. 14.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 120
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 20
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 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 right (b) points up and left (c) points left (d) points right
18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
19. 19.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
22. 22.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 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 right (c) points up and right (d) points straight up
24. 24.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
26. 26.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
27. 27.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
29. 29.🦾 A servo moves from 10° to 180°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 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 left (b) points straight up (c) points up and right (d) points right
32. 32.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
33. 33.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
34. 34.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
35. 35.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
36. 36.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
38. 38.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
39. 39.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo moves from 60° to 20°. How many degrees does it turn?

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