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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 136 · 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 moves from 50° to 90°. How many degrees does it turn?
  2. 2.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  4. 4.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle − 60
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  6. 6.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  7. 7.🦾 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 straight up (c) points right (d) points up and left
  8. 8.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  9. 9.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  10. 10.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  11. 11.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  12. 12.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  14. 14.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  15. 15.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
  16. 16.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
  17. 17.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  20. 20.🦾 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 left (b) points straight up (c) points up and left (d) points right
  21. 21.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  22. 22.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
  23. 23.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
  25. 25.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  26. 26.🦾 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 left (c) points up and left (d) points up and right
  27. 27.🦾 A servo moves from 10° to 110°. How many degrees does it turn?
  28. 28.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle + 20
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  29. 29.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  30. 30.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  31. 31.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  32. 32.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  33. 33.🦾 A servo moves from 20° to 140°. How many degrees does it turn?
  34. 34.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  35. 35.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  36. 36.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  38. 38.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  40. 40.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. 40
  2. 130
  3. a servo motor
  4. 90
  5. 50
  6. False
  7. points up and right
  8. 70
  9. a servo motor
  10. True
  11. a DC motor
  12. False
  13. a DC motor
  14. a DC motor
  15. 180°
  16. movement
  17. True
  18. a servo motor
  19. 200
  20. points left
  21. 40
  22. a servo motor
  23. a DC motor
  24. a DC motor
  25. True
  26. points right
  27. 100
  28. 100
  29. a servo motor
  30. True
  31. True
  32. False
  33. 120
  34. a DC motor
  35. True
  36. 60
  37. False
  38. False
  39. False
  40. 110

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