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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 244 · 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 straight up (b) points up and left (c) points right (d) points left
  2. 2.🦾 A servo moves from 180° to 0°. How many degrees does it turn?
  3. 3.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  4. 4.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
  5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  6. 6.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  7. 7.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
  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 = 150
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  12. 12.🦾 A servo moves from 150° to 110°. How many degrees does it turn?
  13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
  14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  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 right (c) points up and right (d) points up and left
  16. 16.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  17. 17.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  19. 19.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  20. 20.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle − 30
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  21. 21.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  22. 22.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  23. 23.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  24. 24.🦾 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 up and left (c) points left (d) points up and right
  25. 25.🦾 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 right (b) points left (c) points straight up (d) points up and left
  26. 26.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
  27. 27.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  28. 28.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  29. 29.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
  30. 30.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
  31. 31.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  32. 32.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 50
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
  35. 35.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 60
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  38. 38.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  39. 39.⚙️ 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
  40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True

Answer key

  1. points straight up
  2. 180
  3. 30
  4. 10
  5. a servo motor
  6. 60
  7. 40
  8. False
  9. 110
  10. a DC motor
  11. a DC motor
  12. 40
  13. a servo motor
  14. 100
  15. points right
  16. True
  17. True
  18. a servo motor
  19. a servo motor
  20. 150
  21. 50
  22. False
  23. a DC motor
  24. points up and left
  25. points up and right
  26. 10
  27. True
  28. False
  29. movement
  30. swap its two wires
  31. False
  32. 120
  33. 110
  34. 60
  35. 50
  36. a DC motor
  37. a servo motor
  38. True
  39. a DC motor
  40. True

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