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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 462 · 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.🦾 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 right (c) points up and right (d) points left
  2. 2.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  3. 3.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  4. 4.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  5. 5.🦾 A servo moves from 130° to 80°. How many degrees does it turn?
  6. 6.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  7. 7.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
  8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  9. 9.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  10. 10.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  11. 11.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  13. 13.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
  14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  15. 15.True or false: “usually turns 0° to 180°” is true of a DC 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.🦾 A servo moves from 80° to 30°. How many degrees does it turn?
  18. 18.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
  19. 19.🦾 A servo moves from 80° to 100°. How many degrees does it turn?
  20. 20.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  21. 21.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle − 10
    angle = angle + 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  22. 22.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  23. 23.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle + 50
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 A servo moves from 80° to 120°. How many degrees does it turn?
  25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
  26. 26.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  27. 27.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  28. 28.🦾 A servo program runs:
    angle = 80
    angle = angle − 30
    angle = angle − 40
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 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 left (c) points up and right (d) points left
  30. 30.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  31. 31.🦾 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 straight up (b) points up and right (c) points left (d) points up and left
  32. 32.🦾 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 left (c) points up and right (d) points straight up
  33. 33.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
  34. 34.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
  35. 35.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  36. 36.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  37. 37.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  38. 38.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  40. 40.⚙️ 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

Answer key

  1. points right
  2. True
  3. False
  4. 40
  5. 50
  6. True
  7. 80
  8. a servo motor
  9. True
  10. False
  11. 60
  12. 150
  13. 180°
  14. 250
  15. False
  16. a DC motor
  17. 50
  18. movement
  19. 20
  20. False
  21. 110
  22. 30
  23. 60
  24. 40
  25. a DC motor
  26. 170
  27. True
  28. 50
  29. points up and right
  30. a servo motor
  31. points up and left
  32. points left
  33. swap its two wires
  34. 40
  35. a DC motor
  36. a DC motor
  37. a servo motor
  38. True
  39. 140
  40. a servo motor

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