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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 466 · 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 faster with more V” is true of a servo motor. (a) True (b) False
  2. 2.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  3. 3.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  4. 4.🦾 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 left (c) points right (d) points up and right
  5. 5.🦾 A servo moves from 10° to 90°. How many degrees does it turn?
  6. 6.🦾 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 up and left (c) points left (d) points straight up
  7. 7.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
  8. 8.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle + 30
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  10. 10.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
  11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
  12. 12.🦾 A servo moves from 0° to 180°. How many degrees does it turn?
  13. 13.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  14. 14.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  17. 17.🦾 A servo moves from 150° to 120°. How many degrees does it turn?
  18. 18.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 30
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 20
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  20. 20.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  22. 22.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
  23. 23.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  24. 24.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  25. 25.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  26. 26.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  27. 27.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 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 right (d) points up and right
  30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  32. 32.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  33. 33.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  34. 34.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
  35. 35.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  37. 37.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  39. 39.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 10
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  40. 40.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True

Answer key

  1. False
  2. True
  3. True
  4. points left
  5. 80
  6. points up and right
  7. movement
  8. 120
  9. 100
  10. 180°
  11. a DC motor
  12. 180
  13. a DC motor
  14. False
  15. a servo motor
  16. a servo motor
  17. 30
  18. 60
  19. 20
  20. a servo motor
  21. 300
  22. 120
  23. False
  24. True
  25. a servo motor
  26. 50
  27. 30
  28. 90
  29. points right
  30. 50
  31. a DC motor
  32. a DC motor
  33. False
  34. swap its two wires
  35. a DC motor
  36. a servo motor
  37. True
  38. 150
  39. 100
  40. True

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