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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 237 · 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.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  3. 3.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  4. 4.🦾 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 left (b) points up and right (c) points up and left (d) points straight up
  5. 5.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  6. 6.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle − 20
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  7. 7.🦾 A servo moves from 110° to 90°. How many degrees does it turn?
  8. 8.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
  9. 9.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
  10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  12. 12.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
  13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  14. 14.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
  15. 15.⚙️ 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
  16. 16.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  17. 17.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  20. 20.🦾 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 left (c) points up and right (d) points up and left
  21. 21.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  22. 22.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle − 30
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  23. 23.🦾 A servo moves from 170° to 60°. How many degrees does it turn?
  24. 24.🦾 A servo moves from 40° to 100°. How many degrees does it turn?
  25. 25.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  27. 27.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  28. 28.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  29. 29.🦾 A servo moves from 120° to 180°. How many degrees does it turn?
  30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  31. 31.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
  32. 32.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  33. 33.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  34. 34.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  35. 35.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  36. 36.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  37. 37.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  39. 39.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  40. 40.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True

Answer key

  1. 50
  2. False
  3. True
  4. points left
  5. 160
  6. 30
  7. 20
  8. 180°
  9. movement
  10. a DC motor
  11. a DC motor
  12. 140
  13. 200
  14. swap its two wires
  15. a servo motor
  16. 110
  17. False
  18. a servo motor
  19. False
  20. points right
  21. a DC motor
  22. 0
  23. 110
  24. 60
  25. 90
  26. 300
  27. False
  28. False
  29. 60
  30. 250
  31. 50
  32. True
  33. False
  34. a servo motor
  35. 100
  36. a servo motor
  37. a DC motor
  38. a servo motor
  39. a DC motor
  40. True

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