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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 810 · 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 = 90
    angle = angle − 10
    angle = angle − 20
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  2. 2.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  3. 3.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  4. 4.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  6. 6.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  7. 7.🦾 A servo moves from 180° to 150°. How many degrees does it turn?
  8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  9. 9.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 60
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  10. 10.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  11. 11.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  12. 12.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
  13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
  14. 14.🦾 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 right (c) points up and left (d) points left
  15. 15.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
  16. 16.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
  17. 17.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  18. 18.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  19. 19.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  20. 20.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  21. 21.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  24. 24.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  25. 25.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  26. 26.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  27. 27.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle − 60
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  28. 28.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  29. 29.⚙️ 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
  30. 30.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  32. 32.🦾 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 left (b) points up and right (c) points up and left (d) points right
  33. 33.🦾 A servo moves from 140° to 130°. How many degrees does it turn?
  34. 34.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 20
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  35. 35.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 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 right (d) points up and right
  38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  40. 40.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True

Answer key

  1. 30
  2. a servo motor
  3. a servo motor
  4. True
  5. a DC motor
  6. 130
  7. 30
  8. 250
  9. 130
  10. True
  11. True
  12. swap its two wires
  13. a servo motor
  14. points left
  15. 180°
  16. movement
  17. 50
  18. 130
  19. False
  20. 70
  21. False
  22. 150
  23. 100
  24. False
  25. 50
  26. True
  27. 10
  28. a servo motor
  29. a DC motor
  30. False
  31. 300
  32. points right
  33. 10
  34. 90
  35. False
  36. 90
  37. points up and right
  38. a DC motor
  39. 50
  40. True

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