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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 896 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  2. 2.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
  3. 3.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
  4. 4.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 40
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  5. 5.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
  7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  8. 8.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  11. 11.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
  12. 12.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  14. 14.🦾 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 straight up (c) points up and right (d) points right
  15. 15.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
  16. 16.🦾 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 up and left (c) points left (d) points right
  17. 17.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  18. 18.🦾 A servo moves from 50° to 80°. How many degrees does it turn?
  19. 19.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  20. 20.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  21. 21.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  22. 22.🦾 A servo moves from 0° to 180°. How many degrees does it turn?
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  24. 24.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  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: “spins faster with more V” is true of a DC motor. (a) True (b) False
  27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
  28. 28.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  29. 29.🦾 A servo moves from 180° to 70°. How many degrees does it turn?
  30. 30.🦾 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 up and right (b) points right (c) points up and left (d) points left
  31. 31.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  32. 32.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  33. 33.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  34. 34.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
  35. 35.🦾 A servo moves from 50° to 10°. How many degrees does it turn?
  36. 36.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
  37. 37.🦾 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 up and left (c) points right (d) points left
  38. 38.🦾 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 left
  39. 39.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
  40. 40.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True

Answer key

  1. 150
  2. 180°
  3. 130
  4. 60
  5. a DC motor
  6. a DC motor
  7. a servo motor
  8. 20
  9. 200
  10. a DC motor
  11. 60
  12. False
  13. a servo motor
  14. points up and left
  15. movement
  16. points right
  17. False
  18. 30
  19. 130
  20. False
  21. 110
  22. 180
  23. 50
  24. a servo motor
  25. a servo motor
  26. True
  27. a servo motor
  28. True
  29. 110
  30. points left
  31. a DC motor
  32. a servo motor
  33. a DC motor
  34. swap its two wires
  35. 40
  36. 20
  37. points straight up
  38. points up and right
  39. 150
  40. False

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