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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 458 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  2. 2.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  3. 3.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  4. 4.🦾 A servo moves from 110° to 50°. How many degrees does it turn?
  5. 5.⚙️ 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
  6. 6.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  7. 7.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
  8. 8.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  9. 9.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  10. 10.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  11. 11.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
  12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  13. 13.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  14. 14.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  15. 15.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  16. 16.🦾 A servo moves from 110° to 10°. How many degrees does it turn?
  17. 17.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  20. 20.🦾 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 up and right (c) points left (d) points straight up
  21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
  22. 22.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  24. 24.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  26. 26.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  27. 27.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle − 60
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 30
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo moves from 0° to 20°. How many degrees does it turn?
  30. 30.🦾 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 left (b) points up and right (c) points straight up (d) points left
  31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  32. 32.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle + 40
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  33. 33.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  34. 34.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  35. 35.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
  36. 36.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  37. 37.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  38. 38.🦾 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 right (b) points left (c) points up and left (d) points up and right
  39. 39.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  40. 40.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False

Answer key

  1. 300
  2. 40
  3. False
  4. 60
  5. swap its two wires
  6. False
  7. movement
  8. 60
  9. 110
  10. True
  11. 40
  12. a servo motor
  13. a DC motor
  14. 90
  15. True
  16. 100
  17. 170
  18. 100
  19. False
  20. points up and right
  21. a servo motor
  22. 180°
  23. 150
  24. False
  25. a DC motor
  26. False
  27. 20
  28. 80
  29. 20
  30. points left
  31. a servo motor
  32. 100
  33. True
  34. 100
  35. a DC motor
  36. a servo motor
  37. a DC motor
  38. points up and left
  39. a DC motor
  40. False

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