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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 265 · 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.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 40
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  3. 3.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  4. 4.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
  5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  6. 6.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
  7. 7.🦾 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
  8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  14. 14.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  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 up and left (b) points right (c) points up and right (d) points straight up
  16. 16.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  19. 19.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  21. 21.🦾 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 left (b) points right (c) points up and right (d) points straight up
  22. 22.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  23. 23.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  24. 24.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  25. 25.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  26. 26.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
  27. 27.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  28. 28.🦾 A servo moves from 80° to 10°. How many degrees does it turn?
  29. 29.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  30. 30.⚙️ 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
  31. 31.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle + 10
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  32. 32.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  34. 34.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  35. 35.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo moves from 70° to 170°. How many degrees does it turn?
  37. 37.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  38. 38.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  40. 40.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False

Answer key

  1. False
  2. 40
  3. False
  4. movement
  5. a DC motor
  6. swap its two wires
  7. points up and right
  8. a servo motor
  9. a servo motor
  10. 200
  11. a DC motor
  12. a DC motor
  13. a servo motor
  14. True
  15. points right
  16. False
  17. a DC motor
  18. a servo motor
  19. False
  20. a servo motor
  21. points straight up
  22. a servo motor
  23. 100
  24. True
  25. a DC motor
  26. 40
  27. False
  28. 70
  29. 20
  30. a DC motor
  31. 110
  32. True
  33. 250
  34. True
  35. 80
  36. 100
  37. True
  38. False
  39. 150
  40. False

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