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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 279 · 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 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 left (b) points straight up (c) points up and right (d) points right
  2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  5. 5.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
  7. 7.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 30
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  8. 8.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
  10. 10.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  11. 11.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  12. 12.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  14. 14.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  15. 15.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  16. 16.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  17. 17.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  18. 18.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
  19. 19.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
  20. 20.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  21. 21.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  22. 22.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  24. 24.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  25. 25.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  27. 27.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  28. 28.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 30
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
  30. 30.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  31. 31.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  32. 32.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
  33. 33.🦾 A servo moves from 160° to 150°. How many degrees does it turn?
  34. 34.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  35. 35.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  36. 36.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  37. 37.🦾 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 straight up (c) points left (d) points right
  38. 38.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
  39. 39.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle − 30
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. points up and right
  2. 250
  3. 200
  4. a servo motor
  5. True
  6. a DC motor
  7. 30
  8. a servo motor
  9. a servo motor
  10. 140
  11. False
  12. False
  13. a DC motor
  14. True
  15. 70
  16. False
  17. False
  18. 30
  19. swap its two wires
  20. 130
  21. a servo motor
  22. a DC motor
  23. a servo motor
  24. False
  25. a DC motor
  26. a servo motor
  27. True
  28. 120
  29. 40
  30. False
  31. False
  32. 10
  33. 10
  34. False
  35. a DC motor
  36. False
  37. points right
  38. movement
  39. 90
  40. 80

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