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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 300 · 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.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (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 DC motor (c) a light sensor (d) a servo motor
  4. 4.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle + 10
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  5. 5.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
  6. 6.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  7. 7.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
  9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  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 left (b) points straight up (c) points right (d) points up and right
  13. 13.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
  14. 14.🦾 A servo moves from 110° to 130°. How many degrees does it turn?
  15. 15.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 30
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  16. 16.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
  17. 17.🦾 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 up and right (b) points up and left (c) points right (d) points left
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  19. 19.🦾 A servo moves from 110° to 180°. How many degrees does it turn?
  20. 20.🦾 A servo moves from 40° to 70°. How many degrees does it turn?
  21. 21.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 60
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  22. 22.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  23. 23.🦾 A servo moves from 160° to 90°. How many degrees does it turn?
  24. 24.🦾 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 left (b) points up and left (c) points straight up (d) points right
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  27. 27.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  29. 29.🦾 A servo moves from 90° to 70°. How many degrees does it turn?
  30. 30.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  31. 31.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  32. 32.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  33. 33.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 50
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  34. 34.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  35. 35.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  37. 37.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  38. 38.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  40. 40.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False

Answer key

  1. 50
  2. a servo motor
  3. a DC motor
  4. 40
  5. 90
  6. True
  7. a servo motor
  8. a servo motor
  9. a servo motor
  10. a servo motor
  11. a DC motor
  12. points up and right
  13. swap its two wires
  14. 20
  15. 50
  16. movement
  17. points left
  18. 250
  19. 70
  20. 30
  21. 140
  22. False
  23. 70
  24. points right
  25. 100
  26. 200
  27. True
  28. a DC motor
  29. 20
  30. a servo motor
  31. True
  32. a DC motor
  33. 60
  34. True
  35. 160
  36. 40
  37. a DC motor
  38. False
  39. 110
  40. True

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