Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 14 · 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 moves an arm joint? (a) a DC motor (b) a servo motor
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
3. 3.⚙️ 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
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
6. 6.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
8. 8.🦾 A servo program runs:
   angle = 10
   angle = angle + 50
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
10. 10.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
12. 12.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
13. 13.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
15. 15.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 30
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 10° to 80°. How many degrees does it turn?
17. 17.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo moves from 70° to 150°. How many degrees does it turn?
19. 19.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
21. 21.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
23. 23.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
26. 26.🦾 A servo moves from 170° to 180°. How many degrees does it turn?
27. 27.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
31. 31.🦾 A servo moves from 10° to 180°. How many degrees does it turn?
32. 32.🦾 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 up and right (b) points straight up (c) points left (d) points right
33. 33.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
34. 34.🦾 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 left (c) points straight up (d) points right
35. 35.🦾 A servo moves from 10° to 50°. How many degrees does it turn?
36. 36.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
37. 37.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
40. 40.🦾 A servo moves from 60° to 110°. How many degrees does it turn?

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