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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 737 · 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.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  2. 2.🦾 A servo moves from 150° to 170°. How many degrees does it turn?
  3. 3.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
  4. 4.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
  6. 6.🦾 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 straight up (b) points up and right (c) points right (d) points up and left
  7. 7.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
  8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  9. 9.🦾 A servo moves from 150° to 140°. How many degrees does it turn?
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  11. 11.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  12. 12.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  13. 13.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  14. 14.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  15. 15.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  16. 16.🦾 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 left (b) points straight up (c) points left (d) points right
  17. 17.🦾 A servo moves from 110° to 130°. How many degrees does it turn?
  18. 18.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  19. 19.⚙️ 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
  20. 20.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  21. 21.🦾 A servo moves from 130° to 40°. How many degrees does it turn?
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  23. 23.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    angle = angle + 50
    angle = angle + 50
    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.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  27. 27.⚙️ 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
  28. 28.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  30. 30.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  31. 31.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  32. 32.🦾 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 right (b) points up and right (c) points up and left (d) points left
  33. 33.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  35. 35.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle − 50
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  36. 36.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  37. 37.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  40. 40.True or false: “has just two wires” is true of a DC motor. (a) False (b) True

Answer key

  1. a servo motor
  2. 20
  3. 180°
  4. True
  5. a servo motor
  6. points right
  7. movement
  8. a servo motor
  9. 10
  10. 300
  11. 80
  12. False
  13. False
  14. 0
  15. True
  16. points left
  17. 20
  18. 160
  19. a DC motor
  20. True
  21. 90
  22. 50
  23. 0
  24. 130
  25. False
  26. a servo motor
  27. swap its two wires
  28. a DC motor
  29. 250
  30. True
  31. False
  32. points up and left
  33. a servo motor
  34. False
  35. 50
  36. a servo motor
  37. a DC motor
  38. 20
  39. 90
  40. True

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