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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 691 · 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 moves an arm joint? (a) a DC motor (b) a servo motor
  2. 2.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  3. 3.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
  4. 4.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
  5. 5.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  6. 6.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  7. 7.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  9. 9.⚙️ 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
  10. 10.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle + 40
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  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 up and right (b) points right (c) points straight up (d) points left
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  13. 13.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  14. 14.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 A servo moves from 160° to 50°. How many degrees does it turn?
  16. 16.🦾 A servo moves from 140° to 40°. How many degrees does it turn?
  17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  18. 18.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  19. 19.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  22. 22.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
  24. 24.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  25. 25.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 20
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  27. 27.🦾 A servo program runs:
    angle = 90
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 20
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  29. 29.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  30. 30.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  31. 31.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  33. 33.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
  34. 34.🦾 A servo moves from 70° to 90°. How many degrees does it turn?
  35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle + 10
    angle = angle + 10
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  37. 37.⚙️ 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
  38. 38.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  39. 39.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  40. 40.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a servo motor
  2. True
  3. 10
  4. movement
  5. False
  6. True
  7. 130
  8. 300
  9. swap its two wires
  10. 130
  11. points straight up
  12. 50
  13. True
  14. 140
  15. 110
  16. 100
  17. a DC motor
  18. True
  19. 80
  20. 120
  21. 200
  22. a servo motor
  23. a DC motor
  24. True
  25. 20
  26. a servo motor
  27. 90
  28. 70
  29. a servo motor
  30. a DC motor
  31. 120
  32. a DC motor
  33. 180°
  34. 20
  35. 70
  36. False
  37. a servo motor
  38. 90
  39. a DC motor
  40. 70

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