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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 122 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  2. 2.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
  3. 3.⚙️ 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
  4. 4.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  5. 5.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  6. 6.⚙️ 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
  7. 7.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
  8. 8.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  11. 11.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  12. 12.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
  14. 14.🦾 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 left (b) points right (c) points up and left (d) points straight up
  15. 15.🦾 A servo moves from 10° to 20°. How many degrees does it turn?
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  17. 17.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  19. 19.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  20. 20.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  21. 21.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  22. 22.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  23. 23.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  24. 24.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  25. 25.🦾 A servo program runs:
    angle = 90
    angle = angle + 50
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  27. 27.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  29. 29.🦾 A servo moves from 60° to 170°. How many degrees does it turn?
  30. 30.🦾 A servo moves from 80° to 20°. How many degrees does it turn?
  31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  32. 32.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
  33. 33.🦾 A servo moves from 20° to 30°. How many degrees does it turn?
  34. 34.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  35. 35.🦾 A servo moves from 30° to 50°. How many degrees does it turn?
  36. 36.🦾 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
  37. 37.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  38. 38.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. 50
  2. 180°
  3. a servo motor
  4. False
  5. True
  6. swap its two wires
  7. 40
  8. 10
  9. a DC motor
  10. a servo motor
  11. True
  12. 100
  13. a DC motor
  14. points straight up
  15. 10
  16. 100
  17. 60
  18. a DC motor
  19. a servo motor
  20. False
  21. 120
  22. a servo motor
  23. True
  24. False
  25. 50
  26. 250
  27. 150
  28. a DC motor
  29. 110
  30. 60
  31. a servo motor
  32. points up and left
  33. 10
  34. 140
  35. 20
  36. points right
  37. False
  38. True
  39. 150
  40. 90

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