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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 153 · 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: “drives the wheels” is true of a servo motor. (a) True (b) False
  2. 2.🦾 A servo moves from 30° to 150°. How many degrees does it turn?
  3. 3.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
  4. 4.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  5. 5.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  6. 6.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  7. 7.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  8. 8.🦾 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 right (b) points up and left (c) points left (d) points straight up
  9. 9.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  11. 11.⚙️ 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
  12. 12.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  15. 15.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
  17. 17.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  18. 18.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  19. 19.🦾 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 straight up (c) points up and left (d) points up and right
  20. 20.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
  21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  23. 23.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  24. 24.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  25. 25.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo moves from 100° to 120°. How many degrees does it turn?
  27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  28. 28.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 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 straight up (d) points up and right
  33. 33.🦾 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 left (c) points up and right (d) points straight up
  34. 34.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  35. 35.🦾 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
  36. 36.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  40. 40.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True

Answer key

  1. False
  2. 120
  3. movement
  4. True
  5. False
  6. True
  7. False
  8. points up and left
  9. False
  10. a DC motor
  11. a DC motor
  12. 150
  13. a servo motor
  14. 100
  15. 30
  16. a servo motor
  17. True
  18. a servo motor
  19. points up and right
  20. 180°
  21. a DC motor
  22. 50
  23. a servo motor
  24. 130
  25. 80
  26. 20
  27. a DC motor
  28. 110
  29. 100
  30. 30
  31. 70
  32. points right
  33. points straight up
  34. True
  35. points left
  36. True
  37. 150
  38. a servo motor
  39. a DC motor
  40. True

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