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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 143 · 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 30°?
  2. 2.🦾 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 up and left (c) points right (d) points straight up
  3. 3.🦾 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 straight up (b) points right (c) points left (d) points up and right
  4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
  5. 5.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
  6. 6.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  7. 7.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
  8. 8.⚙️ 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
  9. 9.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  10. 10.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
  11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  12. 12.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
  13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  14. 14.🦾 A servo moves from 40° to 150°. How many degrees does it turn?
  15. 15.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  16. 16.🦾 A servo moves from 150° to 100°. How many degrees does it turn?
  17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  18. 18.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  19. 19.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  21. 21.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  22. 22.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  23. 23.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  24. 24.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle + 10
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  25. 25.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 40
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  26. 26.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  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 left (c) points straight up (d) points right
  28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  30. 30.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  31. 31.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
  32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  34. 34.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  35. 35.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  37. 37.🦾 A servo program runs:
    angle = 90
    angle = angle − 10
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  39. 39.🦾 A servo program runs:
    angle = 120
    angle = angle − 60
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  40. 40.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False

Answer key

  1. 50
  2. points right
  3. points up and right
  4. a servo motor
  5. swap its two wires
  6. False
  7. 180°
  8. a DC motor
  9. False
  10. 90
  11. a DC motor
  12. 140
  13. a DC motor
  14. 110
  15. a DC motor
  16. 50
  17. a servo motor
  18. False
  19. False
  20. 100
  21. True
  22. True
  23. False
  24. 90
  25. 50
  26. True
  27. points left
  28. 90
  29. a DC motor
  30. False
  31. movement
  32. 150
  33. a servo motor
  34. False
  35. a DC motor
  36. True
  37. 40
  38. a servo motor
  39. 50
  40. True

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