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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 563 · 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: “drives the wheels” is true of a DC motor. (a) False (b) True
  2. 2.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  4. 4.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
  6. 6.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  7. 7.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  8. 8.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 20
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  9. 9.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  12. 12.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  14. 14.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  15. 15.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  16. 16.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  17. 17.⚙️ 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
  18. 18.🦾 A servo program runs:
    angle = 130
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 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 up and right (c) points right (d) points left
  20. 20.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
  21. 21.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  22. 22.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  23. 23.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  24. 24.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  25. 25.🦾 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 left (b) points straight up (c) points up and right (d) points up and left
  26. 26.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  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 left (b) points up and left (c) points straight up (d) points right
  28. 28.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  29. 29.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  30. 30.🦾 A servo moves from 110° to 40°. How many degrees does it turn?
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  32. 32.True or false: “spins faster with more V” 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 120°?
  34. 34.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  35. 35.🦾 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 straight up (b) points right (c) points up and right (d) points up and left
  36. 36.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle − 40
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  37. 37.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
  38. 38.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  39. 39.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  40. 40.🦾 A servo moves from 170° to 30°. How many degrees does it turn?

Answer key

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

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