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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 846 · 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.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
  2. 2.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  3. 3.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  4. 4.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
  5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  6. 6.⚙️ 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
  7. 7.🦾 A servo moves from 160° to 20°. How many degrees does it turn?
  8. 8.🦾 A servo moves from 10° to 100°. How many degrees does it turn?
  9. 9.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  11. 11.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 60
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  12. 12.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  14. 14.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
  15. 15.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  16. 16.🦾 A servo moves from 120° to 150°. How many degrees does it turn?
  17. 17.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  18. 18.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  19. 19.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  20. 20.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
  21. 21.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle + 60
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  22. 22.🦾 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 up and right (c) points straight up (d) points up and left
  23. 23.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  24. 24.🦾 A servo moves from 50° to 0°. How many degrees does it turn?
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
  28. 28.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  29. 29.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  30. 30.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  31. 31.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
  32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  34. 34.🦾 A servo moves from 130° to 20°. How many degrees does it turn?
  35. 35.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    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 0°. Where does the arm point? (a) points up and left (b) points straight up (c) points left (d) points right
  37. 37.🦾 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 straight up (c) points left (d) points right
  38. 38.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
  39. 39.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle + 20
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  40. 40.True or false: “has just two wires” is true of a DC motor. (a) True (b) False

Answer key

  1. swap its two wires
  2. False
  3. False
  4. 10
  5. a servo motor
  6. a DC motor
  7. 140
  8. 90
  9. False
  10. a DC motor
  11. 140
  12. False
  13. 200
  14. 180°
  15. 120
  16. 30
  17. True
  18. a servo motor
  19. True
  20. 30
  21. 120
  22. points up and left
  23. a servo motor
  24. 50
  25. 100
  26. a DC motor
  27. a servo motor
  28. 50
  29. False
  30. a DC motor
  31. 60
  32. a servo motor
  33. 300
  34. 110
  35. 90
  36. points right
  37. points left
  38. movement
  39. 100
  40. True

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