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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 297 · 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 30°?
  2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  4. 4.🦾 A servo moves from 10° to 170°. How many degrees does it turn?
  5. 5.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  6. 6.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  7. 7.🦾 A servo program runs:
    angle = 90
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
  9. 9.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  10. 10.⚙️ 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
  11. 11.🦾 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 left (b) points straight up (c) points up and right (d) points up and left
  12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  13. 13.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  14. 14.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  17. 17.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  18. 18.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
  19. 19.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  20. 20.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
  21. 21.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  22. 22.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle − 40
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  23. 23.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  24. 24.🦾 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 right (c) points up and right (d) points left
  25. 25.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  27. 27.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
  28. 28.🦾 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 left (d) points up and right
  29. 29.🦾 A servo moves from 80° to 70°. How many degrees does it turn?
  30. 30.🦾 A servo moves from 120° to 160°. How many degrees does it turn?
  31. 31.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  33. 33.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  34. 34.🦾 A servo moves from 180° to 90°. How many degrees does it turn?
  35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  37. 37.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  38. 38.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
  39. 39.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  40. 40.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 10
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. 50
  2. a servo motor
  3. a DC motor
  4. 160
  5. True
  6. a servo motor
  7. 140
  8. a servo motor
  9. False
  10. swap its two wires
  11. points up and left
  12. a servo motor
  13. a DC motor
  14. True
  15. a DC motor
  16. 150
  17. 50
  18. 180°
  19. False
  20. movement
  21. 90
  22. 90
  23. True
  24. points right
  25. 60
  26. a servo motor
  27. a DC motor
  28. points straight up
  29. 10
  30. 40
  31. 70
  32. 110
  33. True
  34. 90
  35. 250
  36. a DC motor
  37. True
  38. 30
  39. False
  40. 90

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