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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 647 · 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 90°?
  2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  3. 3.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
  4. 4.🦾 A servo moves from 170° to 120°. How many degrees does it turn?
  5. 5.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  6. 6.🦾 A servo moves from 50° to 80°. How many degrees does it turn?
  7. 7.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  8. 8.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  11. 11.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  13. 13.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  14. 14.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 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
  16. 16.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  17. 17.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  18. 18.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  19. 19.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
  21. 21.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  23. 23.⚙️ 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
  24. 24.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
  25. 25.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  26. 26.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  27. 27.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  28. 28.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
  29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  30. 30.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  32. 32.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  33. 33.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  34. 34.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  35. 35.🦾 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 right (b) points up and right (c) points left (d) points up and left
  36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  37. 37.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 40
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
  39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  40. 40.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°

Answer key

  1. 150
  2. a DC motor
  3. movement
  4. 50
  5. 180
  6. 30
  7. 80
  8. False
  9. 50
  10. a servo motor
  11. 50
  12. a servo motor
  13. True
  14. 80
  15. points up and left
  16. True
  17. 70
  18. a DC motor
  19. 100
  20. 30
  21. 120
  22. a servo motor
  23. swap its two wires
  24. 120
  25. 70
  26. False
  27. True
  28. 120
  29. 100
  30. 0
  31. 300
  32. a DC motor
  33. 160
  34. a DC motor
  35. points up and right
  36. True
  37. 80
  38. 40
  39. a DC motor
  40. 180°

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