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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 397 · 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.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  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 turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  6. 6.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
  7. 7.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
  8. 8.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle + 10
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  9. 9.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  11. 11.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
  12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  13. 13.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
  15. 15.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 40
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  16. 16.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  17. 17.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
  18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
  19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 20
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo moves from 140° to 130°. How many degrees does it turn?
  21. 21.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle + 60
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  22. 22.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  23. 23.🦾 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 right (c) points up and left (d) points up and right
  24. 24.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  25. 25.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  26. 26.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  27. 27.🦾 A servo moves from 120° to 170°. How many degrees does it turn?
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  29. 29.🦾 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 left (b) points up and right (c) points straight up (d) points right
  30. 30.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
  31. 31.🦾 A servo moves from 180° to 170°. How many degrees does it turn?
  32. 32.🦾 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 left (d) points right
  33. 33.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
  34. 34.🦾 A servo moves from 0° to 170°. How many degrees does it turn?
  35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  36. 36.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 30
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  39. 39.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
  40. 40.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle + 40
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. 150
  2. True
  3. a servo motor
  4. a servo motor
  5. 50
  6. swap its two wires
  7. movement
  8. 60
  9. False
  10. a DC motor
  11. 60
  12. a DC motor
  13. False
  14. a DC motor
  15. 120
  16. True
  17. 30
  18. a servo motor
  19. 50
  20. 10
  21. 130
  22. a servo motor
  23. points up and left
  24. True
  25. False
  26. False
  27. 50
  28. 100
  29. points up and right
  30. 180°
  31. 10
  32. points right
  33. 40
  34. 170
  35. 300
  36. 60
  37. False
  38. a servo motor
  39. 100
  40. 40

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