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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 695 · 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.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  2. 2.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  3. 3.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  5. 5.🦾 A servo moves from 100° to 120°. How many degrees does it turn?
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  7. 7.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
  8. 8.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
  9. 9.🦾 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 up and left (b) points up and right (c) points straight up (d) points right
  10. 10.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  12. 12.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
  13. 13.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  14. 14.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 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
  16. 16.🦾 A servo moves from 110° to 10°. How many degrees does it turn?
  17. 17.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  18. 18.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
  19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle − 30
    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) False (b) True
  22. 22.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  23. 23.🦾 A servo program runs:
    angle = 60
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  24. 24.⚙️ 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
  25. 25.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  26. 26.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
  27. 27.🦾 A servo moves from 90° to 60°. How many degrees does it turn?
  28. 28.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
  29. 29.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  30. 30.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
  31. 31.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 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 straight up (b) points left (c) points right (d) points up and right
  33. 33.🦾 A servo moves from 150° to 90°. How many degrees does it turn?
  34. 34.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  35. 35.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  36. 36.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo moves from 100° to 80°. How many degrees does it turn?
  38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  39. 39.🦾 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 right (b) points up and left (c) points left (d) points straight up
  40. 40.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor

Answer key

  1. a DC motor
  2. False
  3. False
  4. a servo motor
  5. 20
  6. 250
  7. points straight up
  8. 180°
  9. points up and left
  10. True
  11. 50
  12. swap its two wires
  13. 130
  14. 80
  15. points right
  16. 100
  17. False
  18. movement
  19. 40
  20. 90
  21. False
  22. 30
  23. 30
  24. a servo motor
  25. a servo motor
  26. 20
  27. 30
  28. 80
  29. True
  30. a DC motor
  31. 140
  32. points up and right
  33. 60
  34. a servo motor
  35. False
  36. 150
  37. 20
  38. 100
  39. points left
  40. a DC motor

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