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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 893 · 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 faster with more V? (a) a DC motor (b) a servo motor
  2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  6. 6.🦾 A servo moves from 60° to 100°. How many degrees does it turn?
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  8. 8.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  9. 9.🦾 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 straight up (c) points up and right (d) points up and left
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  11. 11.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  12. 12.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  13. 13.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
  14. 14.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  15. 15.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
  17. 17.🦾 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 right (b) points straight up (c) points left (d) points right
  18. 18.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  19. 19.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  22. 22.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
  23. 23.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
  25. 25.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  26. 26.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  27. 27.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  29. 29.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 10
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  30. 30.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  31. 31.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
  32. 32.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  33. 33.🦾 A servo moves from 90° to 70°. How many degrees does it turn?
  34. 34.🦾 A servo moves from 10° to 0°. How many degrees does it turn?
  35. 35.True or false: “spins round and round” 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 60°?
  37. 37.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  38. 38.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
  39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  40. 40.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle + 40
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a DC motor
  2. a servo motor
  3. a DC motor
  4. a DC motor
  5. a DC motor
  6. 40
  7. 150
  8. 130
  9. points straight up
  10. 250
  11. False
  12. 30
  13. swap its two wires
  14. a servo motor
  15. 60
  16. a DC motor
  17. points left
  18. 150
  19. True
  20. a servo motor
  21. 200
  22. 180°
  23. False
  24. a servo motor
  25. False
  26. a servo motor
  27. True
  28. a DC motor
  29. 60
  30. True
  31. points right
  32. False
  33. 20
  34. 10
  35. False
  36. 100
  37. 50
  38. movement
  39. 50
  40. 80

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