Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 707 · 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 usually turns 0° to 180°? (a) a servo motor (b) a DC motor
2. 2.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
3. 3.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
6. 6.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
7. 7.🦾 A servo program runs:
   angle = 20
   angle = angle − 10
   angle = angle + 10
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
10. 10.⚙️ 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
11. 11.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
12. 12.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
13. 13.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
14. 14.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle + 10
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
16. 16.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
20. 20.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
22. 22.🦾 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 straight up (c) points right (d) points up and left
23. 23.🦾 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 straight up (b) points right (c) points up and right (d) points left
24. 24.🦾 A servo moves from 110° to 30°. How many degrees does it turn?
25. 25.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 80° to 70°. How many degrees does it turn?
27. 27.🦾 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 right (c) points up and left (d) points straight up
28. 28.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 30
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo moves from 50° to 120°. How many degrees does it turn?
31. 31.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo program runs:
    angle = 100
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
35. 35.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
36. 36.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
37. 37.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 170° to 10°. How many degrees does it turn?
40. 40.🦾 A servo moves from 170° to 110°. How many degrees does it turn?

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