Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 47 · 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 DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
4. 4.🦾 A servo program runs:
   angle = 70
   angle = angle + 30
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
5. 5.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
6. 6.True or false: “drives the wheels” is true of a servo 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 = 180
   angle = angle − 60
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
10. 10.🦾 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 right (b) points up and right (c) points straight up (d) points left
11. 11.🦾 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 right (b) points left (c) points up and left (d) points straight up
12. 12.🦾 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 up and right (c) points right (d) points up and left
13. 13.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
15. 15.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
17. 17.🦾 A servo moves from 10° to 100°. How many degrees does it turn?
18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
19. 19.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
21. 21.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
23. 23.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
24. 24.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
27. 27.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 10
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
32. 32.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
34. 34.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 60° to 130°. How many degrees does it turn?
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo moves from 50° to 0°. How many degrees does it turn?
39. 39.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?

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