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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 556 · 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 usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  3. 3.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
  4. 4.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  5. 5.🦾 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 right (b) points left (c) points up and right (d) points straight up
  6. 6.🦾 A servo moves from 10° to 30°. How many degrees does it turn?
  7. 7.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
  8. 8.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 50
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  10. 10.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 50
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  11. 11.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
  12. 12.🦾 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 right (c) points straight up (d) points up and right
  13. 13.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
  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 right (b) points straight up (c) points up and right (d) points left
  15. 15.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  16. 16.🦾 A servo moves from 70° to 90°. How many degrees does it turn?
  17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  18. 18.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  19. 19.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  20. 20.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  21. 21.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  22. 22.🦾 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 right (c) points left (d) points up and right
  23. 23.⚙️ 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
  24. 24.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  25. 25.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  26. 26.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo moves from 120° to 150°. How many degrees does it turn?
  30. 30.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
  31. 31.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  33. 33.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  34. 34.🦾 A servo moves from 120° to 50°. How many degrees does it turn?
  35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  36. 36.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  37. 37.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  38. 38.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  39. 39.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  40. 40.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True

Answer key

  1. False
  2. a servo motor
  3. 180°
  4. True
  5. points up and right
  6. 20
  7. 160
  8. 60
  9. a DC motor
  10. 120
  11. movement
  12. points up and left
  13. swap its two wires
  14. points straight up
  15. False
  16. 20
  17. 250
  18. True
  19. False
  20. True
  21. False
  22. points right
  23. a DC motor
  24. a servo motor
  25. a servo motor
  26. 160
  27. 50
  28. 90
  29. 30
  30. a servo motor
  31. 40
  32. 120
  33. a DC motor
  34. 70
  35. 150
  36. True
  37. False
  38. 170
  39. a servo motor
  40. True

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