Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 291 · 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 = 150
   angle = angle + 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 A servo program runs:
   angle = 150
   angle = angle − 30
   angle = angle + 30
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
4. 4.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
5. 5.🦾 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 left (c) points left (d) points straight up
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
7. 7.🦾 A servo program runs:
   angle = 40
   angle = angle − 40
   angle = angle + 60
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
11. 11.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
12. 12.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
13. 13.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
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 = 180
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle + 10
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 70° to 20°. How many degrees does it turn?
20. 20.🦾 A servo moves from 100° to 70°. How many degrees does it turn?
21. 21.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
22. 22.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
24. 24.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 30
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
30. 30.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo moves from 20° to 100°. How many degrees does it turn?
34. 34.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
36. 36.🦾 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 straight up (b) points up and left (c) points up and right (d) points right
37. 37.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
38. 38.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
39. 39.🦾 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 left (c) points left (d) points straight up
40. 40.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False

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