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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 126 · 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 90°. Where does the arm point? (a) points right (b) points straight up (c) points left (d) points up and left
  2. 2.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  3. 3.🦾 A servo moves from 150° to 60°. How many degrees does it turn?
  4. 4.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  5. 5.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  6. 6.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  8. 8.🦾 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 right (c) points left (d) points up and right
  9. 9.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
  10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  11. 11.🦾 A servo moves from 70° to 130°. How many degrees does it turn?
  12. 12.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
  13. 13.🦾 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 left (b) points straight up (c) points right (d) points up and right
  14. 14.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
  15. 15.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 60
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  19. 19.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  20. 20.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  21. 21.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
  22. 22.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  24. 24.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
  26. 26.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  27. 27.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
  29. 29.🦾 A servo moves from 180° to 0°. How many degrees does it turn?
  30. 30.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle − 50
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
  32. 32.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  33. 33.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  35. 35.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  37. 37.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  38. 38.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  40. 40.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False

Answer key

  1. points straight up
  2. False
  3. 90
  4. True
  5. True
  6. a DC motor
  7. 100
  8. points left
  9. swap its two wires
  10. a DC motor
  11. 60
  12. movement
  13. points up and right
  14. 130
  15. 130
  16. 50
  17. a DC motor
  18. a servo motor
  19. False
  20. 50
  21. 180°
  22. 20
  23. 300
  24. a DC motor
  25. a DC motor
  26. False
  27. True
  28. a servo motor
  29. 180
  30. 40
  31. 60
  32. True
  33. False
  34. True
  35. False
  36. 120
  37. a DC motor
  38. 40
  39. 110
  40. False

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