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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 393 · 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 drives the wheels? (a) a servo motor (b) a DC motor
  2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  3. 3.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  4. 4.🦾 A servo moves from 40° to 0°. How many degrees does it turn?
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  6. 6.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  7. 7.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  8. 8.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
  9. 9.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  10. 10.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
  11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  13. 13.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  14. 14.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 20
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  16. 16.🦾 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 straight up (c) points right (d) points up and right
  17. 17.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  19. 19.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  21. 21.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
  22. 22.🦾 A servo moves from 90° to 50°. How many degrees does it turn?
  23. 23.⚙️ 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
  24. 24.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  25. 25.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  26. 26.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
  27. 27.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  29. 29.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  30. 30.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  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 right (c) points up and left (d) points left
  32. 32.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  33. 33.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 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 right (b) points up and right (c) points left (d) points up and left
  35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 60
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo moves from 110° to 100°. How many degrees does it turn?
  37. 37.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 40
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle + 50
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 A servo moves from 60° to 70°. How many degrees does it turn?
  40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a DC motor
  2. a servo motor
  3. False
  4. 40
  5. 50
  6. True
  7. False
  8. 180°
  9. True
  10. 140
  11. a DC motor
  12. a DC motor
  13. True
  14. 40
  15. a servo motor
  16. points up and left
  17. movement
  18. 250
  19. 50
  20. a servo motor
  21. swap its two wires
  22. 40
  23. a servo motor
  24. True
  25. False
  26. a DC motor
  27. 80
  28. 170
  29. a servo motor
  30. 70
  31. points right
  32. False
  33. 70
  34. points left
  35. 50
  36. 10
  37. 70
  38. 150
  39. 10
  40. 160

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