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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 475 · 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 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 right (b) points up and left (c) points left (d) points straight up
  2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  3. 3.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  5. 5.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
  8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  9. 9.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  10. 10.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 40
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  11. 11.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  13. 13.🦾 A servo moves from 140° to 60°. How many degrees does it turn?
  14. 14.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
  15. 15.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  16. 16.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
  17. 17.🦾 A servo moves from 10° to 30°. How many degrees does it turn?
  18. 18.🦾 A servo moves from 10° to 0°. How many degrees does it turn?
  19. 19.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  20. 20.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  21. 21.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  22. 22.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  23. 23.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  24. 24.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
  25. 25.🦾 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 straight up (c) points right (d) points up and left
  26. 26.🦾 A servo moves from 80° to 30°. How many degrees does it turn?
  27. 27.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  28. 28.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle − 10
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  30. 30.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
  31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  32. 32.🦾 A servo moves from 80° to 10°. How many degrees does it turn?
  33. 33.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  34. 34.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  35. 35.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  37. 37.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 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 straight up (b) points left (c) points up and right (d) points right
  39. 39.🦾 A servo moves from 150° to 170°. How many degrees does it turn?
  40. 40.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor

Answer key

  1. points left
  2. a DC motor
  3. False
  4. 100
  5. 140
  6. a DC motor
  7. a DC motor
  8. a servo motor
  9. 150
  10. 80
  11. True
  12. a DC motor
  13. 80
  14. 70
  15. 140
  16. 180°
  17. 20
  18. 10
  19. 90
  20. True
  21. True
  22. a servo motor
  23. False
  24. movement
  25. points right
  26. 50
  27. False
  28. 70
  29. a DC motor
  30. a servo motor
  31. a servo motor
  32. 70
  33. 80
  34. False
  35. 30
  36. False
  37. 80
  38. points straight up
  39. 20
  40. a servo motor

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