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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 643 · 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 round and round? (a) a servo motor (b) a DC motor
  2. 2.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  3. 3.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
  4. 4.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  5. 5.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  6. 6.🦾 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 up and right (c) points up and left (d) points left
  7. 7.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  8. 8.⚙️ 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
  9. 9.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle − 20
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  10. 10.🦾 A servo moves from 80° to 160°. How many degrees does it turn?
  11. 11.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  12. 12.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 10
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  13. 13.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  14. 14.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  16. 16.⚙️ 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
  17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  18. 18.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
  19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  20. 20.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 50
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  22. 22.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  24. 24.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  25. 25.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  27. 27.🦾 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 up and right (b) points right (c) points up and left (d) points left
  28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 20
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
  30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  31. 31.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  32. 32.🦾 A servo program runs:
    angle = 50
    angle = angle + 50
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 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 up and left (b) points left (c) points right (d) points up and right
  34. 34.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
  35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  36. 36.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
  37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  38. 38.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
  39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  40. 40.🦾 A servo moves from 50° to 110°. How many degrees does it turn?

Answer key

  1. a DC motor
  2. False
  3. points right
  4. a DC motor
  5. a servo motor
  6. points up and left
  7. False
  8. a servo motor
  9. 0
  10. 80
  11. True
  12. 100
  13. a DC motor
  14. False
  15. a servo motor
  16. swap its two wires
  17. a DC motor
  18. 40
  19. a DC motor
  20. 130
  21. a servo motor
  22. a DC motor
  23. 100
  24. True
  25. 40
  26. a servo motor
  27. points up and right
  28. 90
  29. 60
  30. 300
  31. False
  32. 90
  33. points left
  34. 60
  35. 250
  36. 150
  37. 150
  38. 180°
  39. False
  40. 60

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