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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 792 · 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.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  3. 3.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  4. 4.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
  5. 5.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  6. 6.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  7. 7.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  8. 8.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
  9. 9.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  10. 10.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  11. 11.🦾 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 up and left (c) points right (d) points straight up
  12. 12.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
  13. 13.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
  14. 14.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  15. 15.True or false: “has just two wires” 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 135°. Where does the arm point? (a) points left (b) points right (c) points up and left (d) points straight up
  17. 17.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  18. 18.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 20
    angle = angle − 40
    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 buzzer (b) a light sensor (c) a DC motor (d) a servo motor
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  21. 21.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  22. 22.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  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 + 20
    angle = angle − 10
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  26. 26.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  27. 27.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  28. 28.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  29. 29.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
  30. 30.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  32. 32.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  34. 34.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle + 20
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  35. 35.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle + 50
    angle = angle + 60
    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.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  38. 38.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 A servo moves from 100° to 50°. How many degrees does it turn?
  40. 40.🦾 A servo moves from 40° to 170°. How many degrees does it turn?

Answer key

  1. False
  2. a DC motor
  3. True
  4. swap its two wires
  5. a servo motor
  6. 0
  7. True
  8. 10
  9. False
  10. 0
  11. points left
  12. 40
  13. 180°
  14. True
  15. False
  16. points up and left
  17. a DC motor
  18. 110
  19. a DC motor
  20. 300
  21. False
  22. 60
  23. 250
  24. 50
  25. 80
  26. a servo motor
  27. True
  28. a DC motor
  29. a servo motor
  30. True
  31. a DC motor
  32. False
  33. 100
  34. 140
  35. 150
  36. a servo motor
  37. False
  38. 30
  39. 50
  40. 130

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