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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 118 · 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.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle − 30
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
  4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  5. 5.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
  6. 6.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  9. 9.🦾 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 right (b) points up and left (c) points left (d) points straight up
  10. 10.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle + 20
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  11. 11.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  13. 13.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  14. 14.🦾 A servo program runs:
    angle = 60
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
  16. 16.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  17. 17.🦾 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 straight up (d) points right
  18. 18.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  19. 19.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  20. 20.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  21. 21.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  22. 22.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle + 60
    angle = angle + 20
    angle = angle − 60
    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 180°?
  24. 24.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  25. 25.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  26. 26.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  27. 27.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
  28. 28.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  29. 29.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  30. 30.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  31. 31.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
  32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
  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 = 30
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  35. 35.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  36. 36.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
  38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  39. 39.🦾 A servo moves from 90° to 0°. How many degrees does it turn?
  40. 40.🦾 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 up and left (b) points left (c) points right (d) points up and right

Answer key

  1. 150
  2. 80
  3. a servo motor
  4. a DC motor
  5. swap its two wires
  6. False
  7. a servo motor
  8. a DC motor
  9. points straight up
  10. 120
  11. False
  12. 50
  13. a DC motor
  14. 50
  15. 120
  16. True
  17. points right
  18. False
  19. 80
  20. False
  21. True
  22. 120
  23. 300
  24. 130
  25. False
  26. False
  27. 70
  28. a servo motor
  29. 0
  30. True
  31. 180°
  32. a DC motor
  33. 100
  34. 30
  35. a servo motor
  36. 140
  37. 30
  38. a DC motor
  39. 90
  40. points up and left

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