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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 1 · 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) 10° (b) 180° (c) 18° (d) 1800°
  2. 2.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  5. 5.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  6. 6.🦾 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 straight up (b) points up and left (c) points left (d) points right
  7. 7.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 40
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  8. 8.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
  9. 9.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  10. 10.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
  11. 11.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  12. 12.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 30
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  14. 14.🦾 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 left (d) points right
  15. 15.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
  16. 16.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  20. 20.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  21. 21.🦾 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 up and right (c) points left (d) points right
  22. 22.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  23. 23.🦾 A servo moves from 40° to 130°. How many degrees does it turn?
  24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  25. 25.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  26. 26.🦾 A servo moves from 10° to 80°. How many degrees does it turn?
  27. 27.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
  29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  30. 30.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle + 60
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  31. 31.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  32. 32.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  33. 33.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  34. 34.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  35. 35.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  36. 36.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  38. 38.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
  39. 39.🦾 A servo moves from 70° to 100°. How many degrees does it turn?
  40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. 180°
  2. a DC motor
  3. 100
  4. a servo motor
  5. 120
  6. points straight up
  7. 110
  8. 140
  9. True
  10. swap its two wires
  11. a DC motor
  12. 40
  13. a DC motor
  14. points up and right
  15. movement
  16. a servo motor
  17. a servo motor
  18. 200
  19. 150
  20. False
  21. points right
  22. True
  23. 90
  24. 250
  25. a servo motor
  26. 70
  27. a DC motor
  28. a servo motor
  29. a DC motor
  30. 110
  31. False
  32. 120
  33. True
  34. True
  35. False
  36. 120
  37. True
  38. 60
  39. 30
  40. 30

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