Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 275 · 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 program runs:
   angle = 0
   angle = angle + 40
   angle = angle + 50
   angle = angle + 40
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ 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
3. 3.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
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 spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
6. 6.🦾 A servo moves from 50° to 100°. How many degrees does it turn?
7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
8. 8.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
9. 9.🦾 A servo program runs:
   angle = 100
   angle = angle − 20
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo moves from 150° to 30°. How many degrees does it turn?
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
15. 15.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
16. 16.🦾 A servo moves from 100° to 110°. How many degrees does it turn?
17. 17.🦾 A servo moves from 40° to 0°. How many degrees does it turn?
18. 18.🦾 A servo moves from 150° to 130°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo moves from 130° to 30°. How many degrees does it turn?
21. 21.🦾 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 left (b) points up and right (c) points left (d) points right
22. 22.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
25. 25.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
27. 27.🦾 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
28. 28.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
29. 29.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo moves from 110° to 150°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 30° to 80°. How many degrees does it turn?
34. 34.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
35. 35.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo moves from 100° to 50°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?

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