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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 532 · 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.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
  2. 2.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 50
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  3. 3.🦾 A servo moves from 110° to 170°. How many degrees does it turn?
  4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
  5. 5.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 50
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  6. 6.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  8. 8.🦾 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 up and left (c) points left (d) points up and right
  9. 9.🦾 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 straight up (c) points up and right (d) points up and left
  10. 10.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  11. 11.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
  12. 12.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  13. 13.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  14. 14.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 20
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  15. 15.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
  17. 17.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  18. 18.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  22. 22.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  23. 23.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  24. 24.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  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 straight up (b) points right (c) points up and right (d) points up and left
  26. 26.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
  27. 27.🦾 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 up and left (d) points straight up
  28. 28.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
  29. 29.🦾 A servo moves from 140° to 120°. How many degrees does it turn?
  30. 30.🦾 A servo program runs:
    angle = 60
    angle = angle + 10
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
  32. 32.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  33. 33.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  34. 34.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  35. 35.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  37. 37.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  38. 38.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 40
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  39. 39.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  40. 40.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False

Answer key

  1. swap its two wires
  2. 50
  3. 60
  4. a DC motor
  5. 40
  6. True
  7. 300
  8. points left
  9. points up and left
  10. False
  11. 20
  12. a servo motor
  13. False
  14. 90
  15. False
  16. a servo motor
  17. a DC motor
  18. False
  19. a DC motor
  20. a servo motor
  21. 250
  22. 140
  23. True
  24. True
  25. points up and right
  26. movement
  27. points straight up
  28. 180°
  29. 20
  30. 100
  31. 60
  32. a DC motor
  33. 160
  34. True
  35. True
  36. 70
  37. a servo motor
  38. 160
  39. True
  40. True

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