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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 578 · 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: “holds a set angle” is true of a servo motor. (a) True (b) False
  2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
  3. 3.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  5. 5.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  6. 6.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
  8. 8.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  9. 9.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 20
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  10. 10.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  11. 11.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  14. 14.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  15. 15.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  16. 16.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 60
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  18. 18.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  19. 19.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  20. 20.🦾 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 straight up
  21. 21.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  22. 22.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  23. 23.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  25. 25.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
  26. 26.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  27. 27.🦾 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 left (c) points up and right (d) points right
  28. 28.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  29. 29.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  30. 30.🦾 A servo moves from 150° to 180°. How many degrees does it turn?
  31. 31.🦾 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 right (b) points up and left (c) points left (d) points straight up
  32. 32.🦾 A servo moves from 50° to 90°. How many degrees does it turn?
  33. 33.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  35. 35.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
  36. 36.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle − 50
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 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 up and left (c) points left (d) points straight up
  38. 38.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. True
  2. a servo motor
  3. True
  4. 150
  5. True
  6. a DC motor
  7. a DC motor
  8. True
  9. 130
  10. False
  11. 30
  12. 200
  13. a servo motor
  14. a servo motor
  15. 120
  16. 180
  17. a servo motor
  18. True
  19. True
  20. points up and left
  21. True
  22. False
  23. False
  24. 50
  25. 180°
  26. a DC motor
  27. points right
  28. True
  29. a DC motor
  30. 30
  31. points left
  32. 40
  33. a DC motor
  34. 250
  35. movement
  36. 10
  37. points up and right
  38. False
  39. 50
  40. 120

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