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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 8 · 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.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
  2. 2.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  4. 4.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
  5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  9. 9.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  10. 10.🦾 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
  11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  12. 12.🦾 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 up and right (b) points right (c) points straight up (d) points up and left
  13. 13.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  14. 14.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  16. 16.🦾 A servo moves from 140° to 150°. How many degrees does it turn?
  17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  18. 18.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  19. 19.🦾 A servo moves from 100° to 70°. How many degrees does it turn?
  20. 20.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
  21. 21.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  22. 22.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 40
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  24. 24.🦾 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 up and left (b) points up and right (c) points straight up (d) points left
  25. 25.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  26. 26.🦾 A servo moves from 10° to 110°. How many degrees does it turn?
  27. 27.🦾 A servo moves from 150° to 50°. How many degrees does it turn?
  28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  29. 29.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  30. 30.🦾 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 up and right (b) points left (c) points up and left (d) points right
  31. 31.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  34. 34.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
  35. 35.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  36. 36.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
  37. 37.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  38. 38.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
  39. 39.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?

Answer key

  1. swap its two wires
  2. a DC motor
  3. a DC motor
  4. 150
  5. a servo motor
  6. a servo motor
  7. 50
  8. 100
  9. False
  10. points up and right
  11. True
  12. points up and left
  13. False
  14. 70
  15. 140
  16. 10
  17. a servo motor
  18. a DC motor
  19. 30
  20. movement
  21. a servo motor
  22. 20
  23. a servo motor
  24. points left
  25. False
  26. 100
  27. 100
  28. a DC motor
  29. True
  30. points right
  31. 110
  32. 90
  33. 60
  34. 180°
  35. True
  36. a DC motor
  37. True
  38. a servo motor
  39. False
  40. 250

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