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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 512 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
  2. 2.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  4. 4.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  8. 8.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
  9. 9.🦾 A servo program runs:
    angle = 90
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  10. 10.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
  11. 11.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
  14. 14.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  15. 15.🦾 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 up and left (b) points straight up (c) points up and right (d) points left
  16. 16.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  17. 17.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
  18. 18.🦾 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
  19. 19.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  20. 20.🦾 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 up and left (b) points straight up (c) points up and right (d) points left
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  24. 24.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  25. 25.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  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 right (b) points up and left (c) points up and right (d) points straight up
  27. 27.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  28. 28.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  29. 29.🦾 A servo moves from 150° to 170°. How many degrees does it turn?
  30. 30.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  31. 31.🦾 A servo moves from 120° to 110°. How many degrees does it turn?
  32. 32.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  33. 33.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
  34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  35. 35.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
  36. 36.🦾 A servo moves from 40° to 50°. How many degrees does it turn?
  37. 37.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  39. 39.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True

Answer key

  1. a servo motor
  2. 10
  3. a servo motor
  4. 100
  5. 250
  6. a servo motor
  7. a DC motor
  8. 90
  9. 90
  10. 180°
  11. a servo motor
  12. a DC motor
  13. a DC motor
  14. False
  15. points straight up
  16. False
  17. swap its two wires
  18. points right
  19. True
  20. points up and left
  21. 300
  22. a DC motor
  23. 50
  24. a DC motor
  25. False
  26. points up and right
  27. a DC motor
  28. False
  29. 20
  30. True
  31. 10
  32. True
  33. movement
  34. 100
  35. 40
  36. 10
  37. 50
  38. 130
  39. True
  40. True

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