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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 380 · 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 motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
  2. 2.🦾 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 up and right (b) points up and left (c) points straight up (d) points right
  3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
  4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  5. 5.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  6. 6.🦾 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 straight up (b) points up and right (c) points right (d) points left
  7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  8. 8.🦾 A servo program runs:
    angle = 60
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
  10. 10.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 60
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  11. 11.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  12. 12.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  13. 13.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  14. 14.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 A servo moves from 60° to 150°. How many degrees does it turn?
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  17. 17.🦾 A servo moves from 160° to 140°. How many degrees does it turn?
  18. 18.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
  19. 19.🦾 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 left (b) points right (c) points straight up (d) points up and right
  20. 20.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  21. 21.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  24. 24.🦾 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 left (d) points up and right
  25. 25.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  28. 28.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  29. 29.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 50
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  30. 30.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  31. 31.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  33. 33.🦾 A servo moves from 70° to 150°. How many degrees does it turn?
  34. 34.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 20
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  35. 35.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  36. 36.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  39. 39.🦾 A servo moves from 100° to 90°. How many degrees does it turn?
  40. 40.True or false: “spins round and round” is true of a servo motor. (a) False (b) True

Answer key

  1. movement
  2. points up and right
  3. a DC motor
  4. 150
  5. True
  6. points left
  7. a DC motor
  8. 30
  9. a servo motor
  10. 0
  11. False
  12. 90
  13. 150
  14. 70
  15. 90
  16. 100
  17. 20
  18. swap its two wires
  19. points right
  20. False
  21. 180°
  22. 50
  23. a servo motor
  24. points straight up
  25. False
  26. a DC motor
  27. 200
  28. True
  29. 120
  30. False
  31. a DC motor
  32. a servo motor
  33. 80
  34. 90
  35. True
  36. True
  37. a DC motor
  38. a DC motor
  39. 10
  40. False

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