Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 102 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
4. 4.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
6. 6.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
7. 7.🦾 A servo program runs:
   angle = 140
   angle = angle − 20
   angle = angle + 10
   angle = angle + 40
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
9. 9.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
11. 11.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 110° to 40°. How many degrees does it turn?
15. 15.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
16. 16.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
17. 17.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
18. 18.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
20. 20.🦾 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 straight up (b) points up and left (c) points right (d) points up and right
21. 21.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
22. 22.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 40
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
24. 24.🦾 A servo moves from 30° to 160°. How many degrees does it turn?
25. 25.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
26. 26.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
27. 27.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 80° to 50°. How many degrees does it turn?
29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
31. 31.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle + 10
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo program runs:
    angle = 90
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
36. 36.🦾 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
37. 37.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
38. 38.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
40. 40.True or false: “has just two wires” is true of a servo motor. (a) False (b) True

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