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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 444 · 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 program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  2. 2.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
  3. 3.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle + 40
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  4. 4.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
  5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  6. 6.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  8. 8.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  9. 9.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  10. 10.🦾 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 right (c) points left (d) points up and right
  11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  12. 12.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
  13. 13.🦾 A servo moves from 10° to 90°. How many degrees does it turn?
  14. 14.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  15. 15.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  16. 16.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  17. 17.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  18. 18.🦾 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 left (c) points up and right (d) points right
  19. 19.🦾 A servo moves from 130° to 80°. How many degrees does it turn?
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  21. 21.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  22. 22.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  23. 23.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  24. 24.⚙️ 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
  25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  26. 26.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  27. 27.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  28. 28.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  29. 29.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  30. 30.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
  31. 31.🦾 A servo moves from 70° to 40°. How many degrees does it turn?
  32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
  33. 33.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  34. 34.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 60
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  35. 35.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
  36. 36.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  38. 38.🦾 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 left (c) points right (d) points up and right
  39. 39.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
  40. 40.🦾 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 left

Answer key

  1. 30
  2. movement
  3. 90
  4. 80
  5. a DC motor
  6. 20
  7. 200
  8. 100
  9. 100
  10. points left
  11. 50
  12. 20
  13. 80
  14. False
  15. a servo motor
  16. True
  17. False
  18. points up and right
  19. 50
  20. 100
  21. True
  22. 90
  23. True
  24. a servo motor
  25. a servo motor
  26. True
  27. True
  28. False
  29. True
  30. 180°
  31. 30
  32. a DC motor
  33. False
  34. 70
  35. swap its two wires
  36. 120
  37. True
  38. points up and left
  39. 30
  40. points right

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