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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 36 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  2. 2.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  5. 5.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
  7. 7.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
  8. 8.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 20
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  9. 9.🦾 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 right (b) points right (c) points straight up (d) points up and left
  10. 10.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  11. 11.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
  12. 12.🦾 A servo moves from 110° to 20°. How many degrees does it turn?
  13. 13.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
  14. 14.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  15. 15.🦾 A servo moves from 180° to 110°. How many degrees does it turn?
  16. 16.🦾 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 up and left (b) points straight up (c) points up and right (d) points left
  17. 17.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  18. 18.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 50
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  19. 19.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  21. 21.🦾 A servo moves from 110° to 150°. How many degrees does it turn?
  22. 22.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
  23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  24. 24.🦾 A servo moves from 50° to 160°. How many degrees does it turn?
  25. 25.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  27. 27.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo moves from 10° to 30°. How many degrees does it turn?
  29. 29.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 20
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  30. 30.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
  31. 31.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  32. 32.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  33. 33.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  34. 34.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  35. 35.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  36. 36.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  38. 38.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  39. 39.🦾 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 right (b) points up and right (c) points up and left (d) points straight up
  40. 40.🦾 A servo moves from 60° to 30°. How many degrees does it turn?

Answer key

  1. True
  2. a DC motor
  3. 100
  4. a DC motor
  5. False
  6. a servo motor
  7. 20
  8. 90
  9. points right
  10. False
  11. 180°
  12. 90
  13. swap its two wires
  14. a servo motor
  15. 70
  16. points up and right
  17. True
  18. 90
  19. a servo motor
  20. 200
  21. 40
  22. 10
  23. a servo motor
  24. 110
  25. 150
  26. 50
  27. 80
  28. 20
  29. 10
  30. movement
  31. 110
  32. True
  33. a servo motor
  34. 130
  35. True
  36. 50
  37. True
  38. a DC motor
  39. points straight up
  40. 30

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