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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 566 · 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 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 right (b) points left (c) points right (d) points straight up
  2. 2.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  3. 3.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  4. 4.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  6. 6.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  7. 7.🦾 A servo moves from 50° to 130°. How many degrees does it turn?
  8. 8.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  11. 11.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 50
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  12. 12.⚙️ 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
  13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  14. 14.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  15. 15.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 10
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
  17. 17.🦾 A servo moves from 20° to 80°. How many degrees does it turn?
  18. 18.🦾 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 right (b) points left (c) points up and left (d) points right
  19. 19.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
  20. 20.🦾 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 up and right (c) points straight up (d) points right
  21. 21.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  22. 22.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  23. 23.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
  24. 24.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  25. 25.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  26. 26.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  27. 27.🦾 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 right (b) points up and left (c) points straight up (d) points left
  28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 10
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  30. 30.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  32. 32.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  33. 33.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  34. 34.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  35. 35.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
  36. 36.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  37. 37.🦾 A servo moves from 110° to 170°. How many degrees does it turn?
  38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  39. 39.🦾 A servo moves from 80° to 70°. How many degrees does it turn?
  40. 40.🦾 A servo program runs:
    angle = 110
    angle = angle − 40
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. points right
  2. False
  3. True
  4. 40
  5. a DC motor
  6. True
  7. 80
  8. 80
  9. a servo motor
  10. 50
  11. 70
  12. swap its two wires
  13. 250
  14. a DC motor
  15. 50
  16. a DC motor
  17. 60
  18. points up and left
  19. movement
  20. points straight up
  21. True
  22. 80
  23. 140
  24. False
  25. True
  26. False
  27. points left
  28. 50
  29. 150
  30. a servo motor
  31. 100
  32. True
  33. False
  34. 80
  35. 180°
  36. a servo motor
  37. 60
  38. a DC motor
  39. 10
  40. 40

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