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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 398 · 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.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  2. 2.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  4. 4.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  6. 6.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
  7. 7.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
  8. 8.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  9. 9.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  10. 10.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
  11. 11.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  13. 13.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  14. 14.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  15. 15.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  16. 16.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  18. 18.🦾 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 right (b) points up and right (c) points left (d) points straight up
  19. 19.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  20. 20.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  21. 21.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  22. 22.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  23. 23.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  26. 26.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
  27. 27.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
  28. 28.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  29. 29.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  30. 30.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  33. 33.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  34. 34.🦾 A servo moves from 10° to 80°. How many degrees does it turn?
  35. 35.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
  36. 36.🦾 A servo moves from 10° to 130°. 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 135°. Where does the arm point? (a) points up and right (b) points up and left (c) points right (d) points straight up
  38. 38.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  39. 39.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
  40. 40.True or false: “has just two wires” is true of a servo motor. (a) True (b) False

Answer key

  1. a servo motor
  2. 10
  3. a DC motor
  4. 100
  5. False
  6. movement
  7. 30
  8. 120
  9. True
  10. 40
  11. False
  12. 300
  13. False
  14. False
  15. False
  16. True
  17. a DC motor
  18. points right
  19. a servo motor
  20. a servo motor
  21. False
  22. True
  23. True
  24. a servo motor
  25. 200
  26. swap its two wires
  27. 40
  28. a DC motor
  29. a servo motor
  30. a DC motor
  31. 150
  32. 250
  33. a servo motor
  34. 70
  35. 180°
  36. 120
  37. points up and left
  38. 140
  39. a DC motor
  40. False

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