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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 171 · 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.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  2. 2.⚙️ 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
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  6. 6.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  7. 7.🦾 A servo program runs:
    angle = 150
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  8. 8.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  9. 9.🦾 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 left (d) points right
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  11. 11.🦾 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 right (b) points up and right (c) points left (d) points straight up
  12. 12.🦾 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 up and left (b) points left (c) points up and right (d) points right
  13. 13.🦾 A servo moves from 50° to 90°. How many degrees does it turn?
  14. 14.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  16. 16.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  17. 17.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  18. 18.🦾 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 up and right
  19. 19.🦾 A servo moves from 130° to 120°. How many degrees does it turn?
  20. 20.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  21. 21.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
  22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  23. 23.🦾 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 up and right (c) points up and left (d) points left
  24. 24.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
  25. 25.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  26. 26.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  27. 27.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  28. 28.🦾 A servo moves from 180° to 130°. How many degrees does it turn?
  29. 29.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  33. 33.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
  34. 34.⚙️ 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
  35. 35.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  37. 37.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
  38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  39. 39.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  40. 40.🦾 A servo moves from 20° to 50°. How many degrees does it turn?

Answer key

  1. False
  2. a servo motor
  3. 100
  4. a DC motor
  5. a DC motor
  6. True
  7. 120
  8. a DC motor
  9. points left
  10. 50
  11. points straight up
  12. points right
  13. 40
  14. False
  15. a servo motor
  16. 140
  17. True
  18. points up and left
  19. 10
  20. True
  21. movement
  22. a DC motor
  23. points up and right
  24. 120
  25. a servo motor
  26. True
  27. False
  28. 50
  29. 70
  30. 80
  31. 70
  32. 150
  33. 180°
  34. swap its two wires
  35. False
  36. 150
  37. a DC motor
  38. a servo motor
  39. False
  40. 30

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