Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 261 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
6. 6.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo program runs:
   angle = 50
   angle = angle + 10
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
9. 9.🦾 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 left (c) points right (d) points up and left
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle − 30
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
14. 14.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
15. 15.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 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 up and right (c) points left (d) points right
17. 17.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo moves from 10° to 0°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 60
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
21. 21.🦾 A servo moves from 20° to 50°. How many degrees does it turn?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
23. 23.🦾 A servo moves from 60° to 140°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo moves from 90° to 10°. How many degrees does it turn?
26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
27. 27.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
28. 28.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
29. 29.🦾 A servo moves from 90° to 160°. How many degrees does it turn?
30. 30.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
31. 31.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
32. 32.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
33. 33.🦾 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 left (b) points straight up (c) points left (d) points up and right
34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
35. 35.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
37. 37.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
38. 38.🦾 A servo moves from 20° to 140°. How many degrees does it turn?
39. 39.🦾 A servo moves from 30° to 160°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

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