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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 6 · 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 150°?
  2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  6. 6.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  8. 8.⚙️ DC motor or servo motor: which one holds a set angle? (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 = 20
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  11. 11.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  12. 12.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 50
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  13. 13.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  14. 14.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
  17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  19. 19.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
  20. 20.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
  21. 21.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
  22. 22.🦾 A servo moves from 170° to 0°. How many degrees does it turn?
  23. 23.🦾 A servo moves from 140° to 150°. How many degrees does it turn?
  24. 24.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  26. 26.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
  27. 27.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo moves from 130° to 110°. How many degrees does it turn?
  29. 29.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  31. 31.🦾 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 left (c) points up and left (d) points straight up
  32. 32.🦾 A servo moves from 110° to 70°. How many degrees does it turn?
  33. 33.🦾 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 left (c) points straight up (d) points up and right
  34. 34.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle − 50
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo moves from 160° to 150°. How many degrees does it turn?
  38. 38.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  39. 39.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  40. 40.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True

Answer key

  1. 250
  2. 100
  3. a servo motor
  4. a DC motor
  5. a DC motor
  6. swap its two wires
  7. 150
  8. a servo motor
  9. a servo motor
  10. 70
  11. 110
  12. 30
  13. True
  14. True
  15. 50
  16. a DC motor
  17. a DC motor
  18. a servo motor
  19. movement
  20. a servo motor
  21. 170
  22. 170
  23. 10
  24. True
  25. 200
  26. 180°
  27. 0
  28. 20
  29. False
  30. a DC motor
  31. points left
  32. 40
  33. points straight up
  34. True
  35. 40
  36. 10
  37. 10
  38. True
  39. False
  40. False

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