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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 469 · 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 reverses if wires swap? (a) a servo motor (b) a DC motor
  2. 2.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  3. 3.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
  6. 6.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  7. 7.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  8. 8.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
  9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  10. 10.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  11. 11.🦾 A servo moves from 70° to 170°. How many degrees does it turn?
  12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  13. 13.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
  14. 14.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  15. 15.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  17. 17.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
  18. 18.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  19. 19.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  21. 21.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
  22. 22.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  24. 24.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  25. 25.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  26. 26.🦾 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 up and right (c) points left (d) points right
  27. 27.🦾 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 right (c) points up and left (d) points left
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  30. 30.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
  31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  32. 32.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  33. 33.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle + 20
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 A servo moves from 180° to 0°. How many degrees does it turn?
  35. 35.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  37. 37.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo 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 straight up (b) points up and left (c) points right (d) points left
  39. 39.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  40. 40.🦾 A servo moves from 100° to 50°. How many degrees does it turn?

Answer key

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

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