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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 260 · 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 program runs:
    angle = 10
    angle = angle + 20
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
  4. 4.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
  5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  7. 7.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  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 program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  11. 11.🦾 A servo moves from 170° to 70°. How many degrees does it turn?
  12. 12.🦾 A servo moves from 100° to 110°. How many degrees does it turn?
  13. 13.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
  14. 14.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  15. 15.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 20
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  16. 16.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  17. 17.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  18. 18.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  19. 19.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  21. 21.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  22. 22.🦾 A servo moves from 110° to 60°. How many degrees does it turn?
  23. 23.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
  24. 24.🦾 A servo moves from 180° to 120°. How many degrees does it turn?
  25. 25.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
  26. 26.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
  27. 27.🦾 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 straight up (c) points up and left (d) points left
  28. 28.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  29. 29.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
  30. 30.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  31. 31.🦾 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 straight up (c) points up and right (d) points up and left
  32. 32.🦾 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 right (b) points left (c) points up and right (d) points up and left
  33. 33.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 20
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  35. 35.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  36. 36.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
  37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  38. 38.🦾 A servo moves from 110° to 20°. How many degrees does it turn?
  39. 39.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
  40. 40.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor

Answer key

  1. 30
  2. 100
  3. a DC motor
  4. 150
  5. a DC motor
  6. 150
  7. False
  8. a DC motor
  9. a servo motor
  10. 170
  11. 100
  12. 10
  13. 180°
  14. a DC motor
  15. 50
  16. a DC motor
  17. 100
  18. False
  19. True
  20. a DC motor
  21. 170
  22. 50
  23. 40
  24. 60
  25. swap its two wires
  26. 20
  27. points left
  28. 180
  29. movement
  30. False
  31. points straight up
  32. points up and left
  33. 60
  34. 140
  35. a servo motor
  36. 150
  37. 50
  38. 90
  39. a servo motor
  40. a servo motor

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