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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 267 · 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 = 10
    angle = angle + 10
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  5. 5.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
  6. 6.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
  7. 7.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  8. 8.🦾 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 left (c) points right (d) points left
  9. 9.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
  10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  11. 11.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  13. 13.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
  14. 14.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  15. 15.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  16. 16.🦾 A servo moves from 50° to 120°. How many degrees does it turn?
  17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
  19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  20. 20.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
  21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  22. 22.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
  23. 23.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  24. 24.🦾 A servo program runs:
    angle = 140
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  26. 26.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  27. 27.🦾 A servo moves from 130° to 100°. How many degrees does it turn?
  28. 28.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  29. 29.🦾 A servo moves from 160° to 70°. How many degrees does it turn?
  30. 30.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  31. 31.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  32. 32.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
  33. 33.🦾 A servo moves from 90° to 80°. How many degrees does it turn?
  34. 34.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 30
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 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 left
  38. 38.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 10
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  39. 39.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. 30
  2. 50
  3. a servo motor
  4. a DC motor
  5. points straight up
  6. movement
  7. a servo motor
  8. points up and left
  9. 180°
  10. a DC motor
  11. 120
  12. a DC motor
  13. 110
  14. False
  15. False
  16. 70
  17. 100
  18. a DC motor
  19. a DC motor
  20. swap its two wires
  21. a DC motor
  22. a servo motor
  23. False
  24. 170
  25. 150
  26. True
  27. 30
  28. False
  29. 90
  30. True
  31. False
  32. 120
  33. 10
  34. True
  35. 50
  36. 100
  37. points right
  38. 70
  39. False
  40. 50

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