Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 497 · 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.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and right (b) points straight up (c) points up and left (d) points left
6. 6.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
7. 7.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
11. 11.🦾 A servo moves from 120° to 130°. How many degrees does it turn?
12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
13. 13.🦾 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 left (c) points up and right (d) points straight up
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
15. 15.🦾 A servo moves from 100° to 80°. How many degrees does it turn?
16. 16.🦾 A servo moves from 160° to 120°. How many degrees does it turn?
17. 17.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 20
    angle = angle + 30
    angle = angle − 20
    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 45°. Where does the arm point? (a) points up and right (b) points right (c) points up and left (d) points straight up
19. 19.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
20. 20.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle − 10
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo moves from 140° to 130°. How many degrees does it turn?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
28. 28.🦾 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 right (d) points straight up
29. 29.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle − 40
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo moves from 160° to 140°. How many degrees does it turn?
36. 36.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 150° to 0°. How many degrees does it turn?
39. 39.🦾 A servo moves from 110° to 100°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor

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