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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 304 · 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 spins faster with more V? (a) a servo motor (b) a DC motor
  2. 2.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  3. 3.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  4. 4.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  5. 5.⚙️ 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
  6. 6.🦾 A servo moves from 150° to 120°. How many degrees does it turn?
  7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  8. 8.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  9. 9.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
  10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  11. 11.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  12. 12.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  13. 13.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  14. 14.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  15. 15.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  17. 17.⚙️ 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
  18. 18.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  21. 21.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  23. 23.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  25. 25.🦾 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 up and left (d) points right
  26. 26.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo 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 moves from 10° to 60°. How many degrees does it turn?
  30. 30.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
  31. 31.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
  32. 32.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  33. 33.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  34. 34.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  35. 35.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 60
    angle = angle − 60
    angle = angle + 50
    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 right (d) points left
  37. 37.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle − 10
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  38. 38.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  39. 39.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  40. 40.True or false: “has just two wires” is true of a servo motor. (a) False (b) True

Answer key

  1. a DC motor
  2. 120
  3. False
  4. True
  5. swap its two wires
  6. 30
  7. a DC motor
  8. a servo motor
  9. 40
  10. a DC motor
  11. True
  12. 110
  13. a servo motor
  14. True
  15. 30
  16. 250
  17. a servo motor
  18. 30
  19. 30
  20. 140
  21. False
  22. 300
  23. 80
  24. 200
  25. points right
  26. 50
  27. a servo motor
  28. a servo motor
  29. 50
  30. movement
  31. 180°
  32. False
  33. False
  34. 100
  35. 110
  36. points left
  37. 160
  38. False
  39. True
  40. False

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