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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 103 · 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 = 150
    angle = angle + 20
    angle = angle + 10
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo moves from 50° to 100°. How many degrees does it turn?
  3. 3.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
  4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
  5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  6. 6.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  8. 8.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  9. 9.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  10. 10.⚙️ 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
  11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  12. 12.🦾 A servo moves from 80° to 30°. How many degrees does it turn?
  13. 13.🦾 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 right (c) points up and left (d) points left
  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 right (b) points left (c) points straight up (d) points up and right
  15. 15.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
  16. 16.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle + 50
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
  18. 18.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points straight up (b) points up and left (c) points right (d) points left
  20. 20.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  24. 24.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  26. 26.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  27. 27.🦾 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 left
  28. 28.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  29. 29.🦾 A servo moves from 70° to 0°. How many degrees does it turn?
  30. 30.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  31. 31.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  32. 32.🦾 A servo moves from 80° to 0°. How many degrees does it turn?
  33. 33.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle + 30
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  34. 34.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
  35. 35.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  36. 36.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  38. 38.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  40. 40.True or false: “spins round and round” is true of a DC motor. (a) False (b) True

Answer key

  1. 180
  2. 50
  3. movement
  4. a servo motor
  5. a servo motor
  6. False
  7. a servo motor
  8. False
  9. 20
  10. a DC motor
  11. 200
  12. 50
  13. points right
  14. points up and right
  15. 180°
  16. 50
  17. 70
  18. 80
  19. points up and left
  20. False
  21. a DC motor
  22. 300
  23. 50
  24. 30
  25. a DC motor
  26. True
  27. points left
  28. True
  29. 70
  30. a servo motor
  31. True
  32. 80
  33. 100
  34. swap its two wires
  35. a DC motor
  36. 70
  37. 90
  38. False
  39. 90
  40. True

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