Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 601 · 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 = 100
   angle = angle − 30
   angle = angle + 20
   angle = angle + 50
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
4. 4.🦾 A servo moves from 100° to 170°. How many degrees does it turn?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
7. 7.🦾 A servo program runs:
   angle = 120
   angle = angle + 10
   angle = angle − 50
   angle = angle + 50
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
9. 9.🦾 A servo program runs:
   angle = 0
   angle = angle + 20
   angle = angle − 20
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
12. 12.🦾 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 up and left (b) points right (c) points left (d) points up and right
13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle − 20
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle + 10
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
19. 19.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
20. 20.🦾 A servo moves from 150° to 120°. How many degrees does it turn?
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
23. 23.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo moves from 0° to 100°. How many degrees does it turn?
25. 25.🦾 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 left
26. 26.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo moves from 70° to 90°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
29. 29.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
33. 33.🦾 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 straight up (d) points up and right
34. 34.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
35. 35.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
36. 36.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
38. 38.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 0° to 20°. How many degrees does it turn?
40. 40.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only

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