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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 602 · 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 program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  3. 3.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  5. 5.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
  8. 8.🦾 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 right (b) points up and left (c) points right (d) points straight up
  9. 9.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  10. 10.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  13. 13.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  17. 17.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  18. 18.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle + 40
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  19. 19.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  20. 20.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
  21. 21.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  22. 22.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  24. 24.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  25. 25.⚙️ 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
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  27. 27.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
  28. 28.🦾 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 up and right (b) points up and left (c) points left (d) points straight up
  29. 29.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle − 30
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  30. 30.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  32. 32.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  33. 33.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  35. 35.🦾 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 up and left (c) points straight up (d) points up and right
  36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  37. 37.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
  38. 38.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  39. 39.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  40. 40.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True

Answer key

  1. 40
  2. 100
  3. 0
  4. a DC motor
  5. movement
  6. 150
  7. a servo motor
  8. points right
  9. True
  10. True
  11. a servo motor
  12. 50
  13. True
  14. a servo motor
  15. a servo motor
  16. a DC motor
  17. True
  18. 100
  19. True
  20. swap its two wires
  21. False
  22. 50
  23. a servo motor
  24. 180
  25. a DC motor
  26. 200
  27. 60
  28. points left
  29. 90
  30. False
  31. a DC motor
  32. True
  33. 60
  34. True
  35. points straight up
  36. 250
  37. 40
  38. False
  39. a servo motor
  40. True

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