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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 471 · 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 moves from 70° to 100°. How many degrees does it turn?
  2. 2.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  3. 3.🦾 A servo program runs:
    angle = 110
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  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 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 right (b) points up and left (c) points left (d) points up and right
  6. 6.🦾 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 up and right (b) points right (c) points up and left (d) points left
  7. 7.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
  9. 9.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  11. 11.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  12. 12.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
  13. 13.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  14. 14.🦾 A servo moves from 20° to 120°. How many degrees does it turn?
  15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (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 150°?
  17. 17.🦾 A servo moves from 60° to 110°. How many degrees does it turn?
  18. 18.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo moves from 150° to 10°. How many degrees does it turn?
  21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  22. 22.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
  23. 23.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
  24. 24.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  25. 25.🦾 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 up and left (c) points right (d) points up and right
  26. 26.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  27. 27.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 50
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  30. 30.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  32. 32.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 40
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  33. 33.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  34. 34.🦾 A servo program runs:
    angle = 150
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  35. 35.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  36. 36.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  37. 37.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  39. 39.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
  40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

Answer key

  1. 30
  2. True
  3. 120
  4. a servo motor
  5. points left
  6. points up and right
  7. True
  8. a DC motor
  9. 60
  10. 300
  11. True
  12. 180°
  13. True
  14. 100
  15. a DC motor
  16. 250
  17. 50
  18. 90
  19. 150
  20. 140
  21. a DC motor
  22. a servo motor
  23. 60
  24. a DC motor
  25. points up and left
  26. False
  27. 90
  28. 30
  29. 60
  30. swap its two wires
  31. 200
  32. 150
  33. False
  34. 170
  35. True
  36. False
  37. a servo motor
  38. a DC motor
  39. movement
  40. 150

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