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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 362 · 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 has a signal wire? (a) a servo motor (b) a DC motor
  2. 2.🦾 A servo moves from 60° to 140°. How many degrees does it turn?
  3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  4. 4.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  5. 5.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  7. 7.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
  8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  9. 9.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  10. 10.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  11. 11.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  12. 12.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
  13. 13.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  14. 14.🦾 A servo moves from 120° to 40°. How many degrees does it turn?
  15. 15.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  16. 16.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
  17. 17.🦾 A servo moves from 70° to 140°. How many degrees does it turn?
  18. 18.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 A servo moves from 60° to 150°. How many degrees does it turn?
  20. 20.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  21. 21.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  22. 22.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  23. 23.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
  24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  25. 25.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo moves from 170° to 10°. How many degrees does it turn?
  27. 27.⚙️ 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
  28. 28.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  29. 29.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 40
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  30. 30.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
  31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  32. 32.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  33. 33.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
  34. 34.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
  35. 35.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 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 right (c) points up and left (d) points left
  37. 37.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 30
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  39. 39.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  40. 40.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a servo motor
  2. 80
  3. a DC motor
  4. True
  5. 50
  6. a servo motor
  7. swap its two wires
  8. a DC motor
  9. False
  10. False
  11. False
  12. points up and left
  13. False
  14. 80
  15. 50
  16. 60
  17. 70
  18. 130
  19. 90
  20. 80
  21. True
  22. 60
  23. 70
  24. 50
  25. 70
  26. 160
  27. a DC motor
  28. a servo motor
  29. 140
  30. movement
  31. a DC motor
  32. False
  33. a servo motor
  34. 180°
  35. 20
  36. points left
  37. 30
  38. 90
  39. False
  40. 80

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