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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 54 · 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.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  2. 2.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
  3. 3.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
  4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  6. 6.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  7. 7.🦾 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 right (c) points straight up (d) points left
  8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  9. 9.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  11. 11.🦾 A servo moves from 150° to 20°. How many degrees does it turn?
  12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
  13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
  14. 14.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  15. 15.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
  16. 16.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle − 30
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  18. 18.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  20. 20.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  21. 21.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  23. 23.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  24. 24.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  27. 27.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  28. 28.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  29. 29.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  30. 30.🦾 A servo moves from 0° to 170°. How many degrees does it turn?
  31. 31.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  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 program runs:
    angle = 110
    angle = angle + 20
    angle = angle − 10
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 40
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  35. 35.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  37. 37.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  38. 38.🦾 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 up and right (b) points left (c) points right (d) points straight up
  39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  40. 40.🦾 A servo moves from 90° to 30°. How many degrees does it turn?

Answer key

  1. False
  2. swap its two wires
  3. 180°
  4. a DC motor
  5. a servo motor
  6. True
  7. points left
  8. 50
  9. 40
  10. 200
  11. 130
  12. a DC motor
  13. a servo motor
  14. a servo motor
  15. movement
  16. 60
  17. 130
  18. False
  19. a servo motor
  20. False
  21. False
  22. a DC motor
  23. True
  24. 40
  25. 150
  26. a servo motor
  27. 110
  28. a DC motor
  29. False
  30. 170
  31. 90
  32. points right
  33. 100
  34. 30
  35. 110
  36. False
  37. False
  38. points straight up
  39. 100
  40. 60

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