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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 829 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
  2. 2.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  3. 3.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
  4. 4.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  5. 5.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  6. 6.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  7. 7.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  8. 8.🦾 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 straight up (b) points up and right (c) points right (d) points up and left
  9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
  11. 11.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  13. 13.🦾 A servo moves from 100° to 180°. How many degrees does it turn?
  14. 14.🦾 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 straight up (b) points left (c) points right (d) points up and right
  15. 15.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  17. 17.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  18. 18.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
  19. 19.🦾 A servo moves from 70° to 120°. How many degrees does it turn?
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  21. 21.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  23. 23.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  24. 24.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle + 50
    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 180°?
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  27. 27.🦾 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 right (b) points up and right (c) points up and left (d) points straight up
  28. 28.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  29. 29.🦾 A servo moves from 120° to 170°. How many degrees does it turn?
  30. 30.🦾 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 right (b) points up and right (c) points straight up (d) points left
  31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  32. 32.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  33. 33.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  34. 34.🦾 A servo moves from 60° to 30°. How many degrees does it turn?
  35. 35.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 50
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo program runs:
    angle = 140
    angle = angle − 10
    angle = angle − 10
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle − 40
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  39. 39.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  40. 40.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor

Answer key

  1. a servo motor
  2. 140
  3. 180°
  4. False
  5. True
  6. a servo motor
  7. False
  8. points right
  9. a servo motor
  10. a DC motor
  11. a DC motor
  12. 150
  13. 80
  14. points left
  15. True
  16. a DC motor
  17. False
  18. swap its two wires
  19. 50
  20. 200
  21. False
  22. 250
  23. True
  24. 150
  25. 300
  26. 50
  27. points up and left
  28. True
  29. 50
  30. points up and right
  31. a servo motor
  32. False
  33. True
  34. 30
  35. 120
  36. 130
  37. 70
  38. 10
  39. True
  40. a DC motor

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