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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 228 · 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 right (c) points left (d) points straight up
  2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
  4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  5. 5.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  6. 6.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 10
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  8. 8.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  9. 9.🦾 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 up and right (c) points straight up (d) points left
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  11. 11.🦾 A servo moves from 90° to 110°. How many degrees does it turn?
  12. 12.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
  13. 13.🦾 A servo moves from 130° to 110°. How many degrees does it turn?
  14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
  15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  17. 17.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 10
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  19. 19.True or false: “has just two wires” 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 DC motor (b) a servo motor
  21. 21.🦾 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 left (b) points straight up (c) points up and left (d) points up and right
  22. 22.🦾 A servo moves from 90° to 0°. How many degrees does it turn?
  23. 23.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  24. 24.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  25. 25.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  26. 26.🦾 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
  27. 27.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  28. 28.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  29. 29.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  30. 30.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
  31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  33. 33.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  34. 34.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  35. 35.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  38. 38.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
  39. 39.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  40. 40.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True

Answer key

  1. points left
  2. 200
  3. a DC motor
  4. a servo motor
  5. False
  6. 70
  7. a DC motor
  8. True
  9. points straight up
  10. 50
  11. 20
  12. 180°
  13. 20
  14. a servo motor
  15. a DC motor
  16. 100
  17. 40
  18. 150
  19. True
  20. a DC motor
  21. points up and left
  22. 90
  23. True
  24. 0
  25. False
  26. points up and right
  27. 160
  28. a DC motor
  29. False
  30. swap its two wires
  31. a servo motor
  32. 250
  33. 30
  34. a servo motor
  35. 90
  36. 140
  37. 70
  38. movement
  39. False
  40. True

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