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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 452 · 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 moves from 40° to 90°. How many degrees does it turn?
  2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a DC motor (d) a buzzer
  3. 3.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  5. 5.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  6. 6.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  7. 7.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
  8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  9. 9.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  10. 10.🦾 A servo moves from 130° to 40°. How many degrees does it turn?
  11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  13. 13.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  15. 15.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  16. 16.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle − 60
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 10
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  18. 18.🦾 A servo moves from 100° to 140°. How many degrees does it turn?
  19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  20. 20.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  21. 21.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  22. 22.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  23. 23.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
  24. 24.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  25. 25.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 40
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  27. 27.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  29. 29.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  30. 30.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 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 left (c) points right (d) points up and right
  33. 33.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  34. 34.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  35. 35.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 60
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  36. 36.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  37. 37.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
  38. 38.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  39. 39.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  40. 40.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False

Answer key

  1. 50
  2. a servo motor
  3. a DC motor
  4. a servo motor
  5. True
  6. False
  7. movement
  8. a servo motor
  9. 140
  10. 90
  11. a DC motor
  12. 50
  13. False
  14. a DC motor
  15. a servo motor
  16. 120
  17. 50
  18. 40
  19. 200
  20. 50
  21. True
  22. 60
  23. 180°
  24. True
  25. 0
  26. a DC motor
  27. 30
  28. 10
  29. True
  30. 90
  31. 60
  32. points up and right
  33. 70
  34. a servo motor
  35. 10
  36. a servo motor
  37. swap its two wires
  38. False
  39. False
  40. False

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