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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 207 · 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 common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
  2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  5. 5.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  8. 8.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  9. 9.🦾 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
  10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  11. 11.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  14. 14.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  15. 15.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
  16. 16.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
  17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
  20. 20.🦾 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
  21. 21.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle + 10
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  22. 22.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  24. 24.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  25. 25.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  26. 26.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  27. 27.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  28. 28.🦾 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 left (b) points up and right (c) points right (d) points left
  29. 29.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo moves from 170° to 0°. How many degrees does it turn?
  31. 31.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  32. 32.⚙️ 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
  33. 33.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
  34. 34.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  37. 37.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  38. 38.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle − 50
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  40. 40.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels

Answer key

  1. 180°
  2. a DC motor
  3. 300
  4. a servo motor
  5. 50
  6. 100
  7. a DC motor
  8. True
  9. points right
  10. a servo motor
  11. False
  12. a DC motor
  13. 150
  14. False
  15. movement
  16. points up and left
  17. a servo motor
  18. 50
  19. a DC motor
  20. points straight up
  21. 160
  22. 80
  23. a servo motor
  24. True
  25. False
  26. True
  27. True
  28. points left
  29. 0
  30. 170
  31. 0
  32. a servo motor
  33. 40
  34. False
  35. 110
  36. False
  37. True
  38. 70
  39. 200
  40. swap its two wires

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