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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 83 · 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.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  2. 2.🦾 A servo moves from 10° to 50°. How many degrees does it turn?
  3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  4. 4.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  5. 5.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  6. 6.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 20
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  8. 8.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  11. 11.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  12. 12.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  13. 13.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
  14. 14.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 40
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
  16. 16.🦾 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
  17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
  19. 19.🦾 A servo moves from 100° to 130°. How many degrees does it turn?
  20. 20.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  21. 21.🦾 A servo program runs:
    angle = 150
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  22. 22.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
  23. 23.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  24. 24.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
  25. 25.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  26. 26.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
  27. 27.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  29. 29.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  30. 30.🦾 A servo moves from 90° to 0°. How many degrees does it turn?
  31. 31.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 40
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 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 up and right (c) points straight up (d) points up and left
  35. 35.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  36. 36.🦾 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 straight up (b) points up and right (c) points left (d) points up and left
  37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  38. 38.🦾 A servo moves from 60° to 100°. How many degrees does it turn?
  39. 39.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 10
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo moves from 10° to 60°. How many degrees does it turn?

Answer key

  1. a servo motor
  2. 40
  3. a DC motor
  4. False
  5. False
  6. 70
  7. a DC motor
  8. False
  9. 50
  10. 200
  11. a servo motor
  12. a DC motor
  13. movement
  14. 100
  15. 30
  16. points up and left
  17. a servo motor
  18. a servo motor
  19. 30
  20. True
  21. 150
  22. a DC motor
  23. 20
  24. 180°
  25. False
  26. swap its two wires
  27. a servo motor
  28. 300
  29. True
  30. 90
  31. 70
  32. 110
  33. 120
  34. points up and right
  35. a DC motor
  36. points left
  37. True
  38. 40
  39. 0
  40. 50

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