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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 906 · 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 = 180
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle + 10
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  4. 4.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  5. 5.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  6. 6.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  8. 8.🦾 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 left (c) points up and left (d) points up and right
  9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  10. 10.🦾 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 right (b) points right (c) points up and left (d) points straight up
  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 program runs:
    angle = 130
    angle = angle + 10
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
  14. 14.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  15. 15.🦾 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 up and left (d) points up and right
  16. 16.🦾 A servo moves from 70° to 170°. How many degrees does it turn?
  17. 17.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
  19. 19.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  20. 20.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
  21. 21.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  22. 22.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
  23. 23.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
  25. 25.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  26. 26.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  27. 27.⚙️ 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
  28. 28.🦾 A servo moves from 170° to 40°. How many degrees does it turn?
  29. 29.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
  30. 30.🦾 A servo moves from 90° to 170°. How many degrees does it turn?
  31. 31.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  32. 32.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 60
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  34. 34.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  35. 35.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  36. 36.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  37. 37.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  38. 38.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 50
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  39. 39.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  40. 40.🦾 A servo moves from 60° to 130°. How many degrees does it turn?

Answer key

  1. 60
  2. 20
  3. 250
  4. False
  5. 150
  6. True
  7. 150
  8. points straight up
  9. 100
  10. points right
  11. a DC motor
  12. 50
  13. a DC motor
  14. False
  15. points left
  16. 100
  17. True
  18. a servo motor
  19. False
  20. movement
  21. a servo motor
  22. 180°
  23. 160
  24. 20
  25. 70
  26. True
  27. swap its two wires
  28. 130
  29. 50
  30. 80
  31. True
  32. 30
  33. a DC motor
  34. 30
  35. False
  36. a DC motor
  37. a servo motor
  38. 100
  39. True
  40. 70

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