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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 349 · 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 holds a set angle? (a) a servo motor (b) a DC motor
  2. 2.🦾 A servo moves from 140° to 60°. How many degrees does it turn?
  3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
  4. 4.True or false: “has a signal wire” is true of a servo 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 fan (c) a buzzer (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 90°. Where does the arm point? (a) points straight up (b) points left (c) points up and left (d) points right
  7. 7.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  8. 8.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  12. 12.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  13. 13.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
  14. 14.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  15. 15.🦾 A servo program runs:
    angle = 70
    angle = angle − 30
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  16. 16.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
  17. 17.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  18. 18.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  19. 19.🦾 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 left (b) points right (c) points up and left (d) points straight up
  20. 20.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
  21. 21.🦾 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 left (b) points up and right (c) points up and left (d) points right
  22. 22.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  23. 23.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 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
  25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  26. 26.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle + 10
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  27. 27.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  28. 28.🦾 A servo moves from 170° to 90°. How many degrees does it turn?
  29. 29.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  30. 30.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  31. 31.🦾 A servo moves from 60° to 30°. How many degrees does it turn?
  32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  33. 33.🦾 A servo moves from 30° to 70°. How many degrees does it turn?
  34. 34.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  35. 35.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
  36. 36.🦾 A servo moves from 0° to 100°. How many degrees does it turn?
  37. 37.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  38. 38.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  39. 39.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle + 60
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo moves from 110° to 180°. How many degrees does it turn?

Answer key

  1. a servo motor
  2. 80
  3. a DC motor
  4. True
  5. a servo motor
  6. points straight up
  7. 0
  8. 120
  9. 150
  10. a servo motor
  11. a DC motor
  12. True
  13. 180°
  14. False
  15. 30
  16. movement
  17. False
  18. True
  19. points left
  20. 130
  21. points right
  22. a servo motor
  23. 80
  24. points up and left
  25. a DC motor
  26. 100
  27. False
  28. 80
  29. a DC motor
  30. False
  31. 30
  32. 100
  33. 40
  34. a servo motor
  35. swap its two wires
  36. 100
  37. 130
  38. False
  39. 90
  40. 70

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