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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 504 · 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 = 70
    angle = angle − 40
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo moves from 150° to 20°. How many degrees does it turn?
  3. 3.🦾 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 up and right (b) points up and left (c) points straight up (d) points right
  4. 4.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  6. 6.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  7. 7.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  9. 9.🦾 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 straight up (b) points up and right (c) points left (d) points right
  10. 10.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
  11. 11.🦾 A servo moves from 110° to 180°. How many degrees does it turn?
  12. 12.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  14. 14.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  15. 15.🦾 A servo moves from 140° to 170°. How many degrees does it turn?
  16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
  17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  18. 18.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
  19. 19.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 20
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 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 left (c) points straight up (d) points right
  21. 21.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  22. 22.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  23. 23.🦾 A servo moves from 110° to 160°. How many degrees does it turn?
  24. 24.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
  25. 25.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  27. 27.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  29. 29.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  30. 30.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  31. 31.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  32. 32.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
  34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  35. 35.🦾 A servo moves from 160° to 150°. How many degrees does it turn?
  36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  38. 38.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
  40. 40.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor

Answer key

  1. 60
  2. 130
  3. points straight up
  4. 140
  5. 200
  6. a servo motor
  7. 110
  8. 300
  9. points right
  10. movement
  11. 70
  12. True
  13. 50
  14. False
  15. 30
  16. a servo motor
  17. a DC motor
  18. 70
  19. 110
  20. points left
  21. 50
  22. False
  23. 50
  24. swap its two wires
  25. a servo motor
  26. 150
  27. True
  28. 250
  29. False
  30. 70
  31. a DC motor
  32. True
  33. a DC motor
  34. 100
  35. 10
  36. 70
  37. a DC motor
  38. False
  39. 40
  40. a DC motor

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