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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 351 · 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: “holds a set angle” is true of a DC motor. (a) False (b) True
  2. 2.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
  3. 3.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle − 20
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  4. 4.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  5. 5.🦾 A servo moves from 100° to 40°. How many degrees does it turn?
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  8. 8.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
  9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  10. 10.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  11. 11.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  12. 12.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  13. 13.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  14. 14.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  15. 15.🦾 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 up and left (b) points left (c) points up and right (d) points right
  16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  17. 17.🦾 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
  18. 18.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 20
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  23. 23.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  24. 24.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 40
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  26. 26.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
  27. 27.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
  28. 28.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
  29. 29.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 30
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  31. 31.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
  33. 33.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  34. 34.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  35. 35.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  36. 36.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  37. 37.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  38. 38.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  39. 39.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  40. 40.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True

Answer key

  1. False
  2. 180°
  3. 20
  4. 70
  5. 60
  6. 100
  7. 300
  8. swap its two wires
  9. 50
  10. True
  11. True
  12. 110
  13. 100
  14. a servo motor
  15. points up and left
  16. a DC motor
  17. points up and right
  18. False
  19. 40
  20. 60
  21. 150
  22. a DC motor
  23. a servo motor
  24. 110
  25. 200
  26. a servo motor
  27. 60
  28. movement
  29. 100
  30. 90
  31. True
  32. a DC motor
  33. a servo motor
  34. True
  35. False
  36. a DC motor
  37. True
  38. a DC motor
  39. True
  40. False

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