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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 322 · 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 common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
  2. 2.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
  3. 3.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
  4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  5. 5.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle + 50
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  6. 6.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  7. 7.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  8. 8.🦾 A servo moves from 120° to 160°. How many degrees does it turn?
  9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  11. 11.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  12. 12.🦾 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 right (d) points left
  13. 13.🦾 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 up and right (c) points straight up (d) points up and left
  14. 14.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  15. 15.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  16. 16.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  17. 17.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
  19. 19.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  20. 20.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  21. 21.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
  22. 22.🦾 A servo moves from 0° to 130°. How many degrees does it turn?
  23. 23.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
  25. 25.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo moves from 160° to 110°. How many degrees does it turn?
  27. 27.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  29. 29.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  33. 33.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  34. 34.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
  35. 35.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  37. 37.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  39. 39.🦾 A servo moves from 0° to 70°. How many degrees does it turn?
  40. 40.🦾 A servo moves from 140° to 90°. How many degrees does it turn?

Answer key

  1. 180°
  2. a DC motor
  3. 120
  4. 200
  5. 130
  6. 150
  7. True
  8. 40
  9. a DC motor
  10. a servo motor
  11. True
  12. points up and right
  13. points right
  14. True
  15. False
  16. True
  17. True
  18. a servo motor
  19. True
  20. a DC motor
  21. movement
  22. 130
  23. 90
  24. 40
  25. 30
  26. 50
  27. 120
  28. 50
  29. True
  30. a servo motor
  31. 100
  32. 20
  33. True
  34. 160
  35. 100
  36. a DC motor
  37. True
  38. a DC motor
  39. 70
  40. 50

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