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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 115 · 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 just two wires? (a) a DC motor (b) a servo motor
  2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  3. 3.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  4. 4.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  5. 5.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
  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 up and left (b) points straight up (c) points right (d) points left
  7. 7.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  8. 8.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  9. 9.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  10. 10.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  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 turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  14. 14.🦾 A servo moves from 90° to 60°. How many degrees does it turn?
  15. 15.🦾 A servo moves from 170° to 180°. How many degrees does it turn?
  16. 16.🦾 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 up and right (c) points right (d) points up and left
  17. 17.🦾 A servo moves from 170° to 70°. How many degrees does it turn?
  18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
  19. 19.True or false: “drives the wheels” 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 90°?
  21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  22. 22.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  23. 23.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle − 10
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  24. 24.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  26. 26.🦾 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 right (c) points up and left (d) points straight up
  27. 27.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 60
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  31. 31.⚙️ 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
  32. 32.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
  33. 33.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  34. 34.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 40
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  35. 35.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle + 20
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo moves from 0° to 20°. How many degrees does it turn?
  37. 37.🦾 A servo moves from 60° to 100°. How many degrees does it turn?
  38. 38.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  40. 40.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a DC motor
  2. a DC motor
  3. True
  4. False
  5. swap its two wires
  6. points straight up
  7. 60
  8. True
  9. False
  10. True
  11. a DC motor
  12. 100
  13. a servo motor
  14. 30
  15. 10
  16. points up and right
  17. 100
  18. a DC motor
  19. False
  20. 150
  21. a DC motor
  22. a servo motor
  23. 120
  24. movement
  25. 200
  26. points right
  27. 90
  28. 40
  29. 30
  30. 50
  31. a servo motor
  32. 180°
  33. a servo motor
  34. 90
  35. 140
  36. 20
  37. 40
  38. False
  39. 250
  40. 10

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