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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 383 · 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: “moves an arm joint” is true of a DC motor. (a) False (b) True
  2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  3. 3.⚙️ 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
  4. 4.🦾 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 straight up (c) points up and right (d) points up and left
  5. 5.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  8. 8.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle − 40
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  9. 9.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
  10. 10.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  11. 11.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  12. 12.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  13. 13.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  14. 14.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
  15. 15.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  16. 16.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  17. 17.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  19. 19.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
  20. 20.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  21. 21.🦾 A servo moves from 130° to 100°. How many degrees does it turn?
  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: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  24. 24.🦾 A servo moves from 10° to 140°. How many degrees does it turn?
  25. 25.🦾 A servo moves from 170° to 40°. How many degrees does it turn?
  26. 26.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
  27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  28. 28.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 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 right (b) points left (c) points up and left (d) points right
  30. 30.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
  31. 31.🦾 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 left (b) points up and right (c) points left (d) points right
  32. 32.🦾 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 left (b) points left (c) points straight up (d) points up and right
  33. 33.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  34. 34.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  35. 35.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  37. 37.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
  38. 38.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle + 20
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  40. 40.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor

Answer key

  1. False
  2. a DC motor
  3. swap its two wires
  4. points up and right
  5. False
  6. a DC motor
  7. 250
  8. 20
  9. movement
  10. False
  11. 0
  12. True
  13. False
  14. 180°
  15. a servo motor
  16. True
  17. True
  18. a servo motor
  19. a servo motor
  20. False
  21. 30
  22. a DC motor
  23. True
  24. 130
  25. 130
  26. 130
  27. 50
  28. 110
  29. points left
  30. 140
  31. points right
  32. points straight up
  33. a servo motor
  34. a servo motor
  35. 10
  36. False
  37. a DC motor
  38. 140
  39. 90
  40. a servo motor

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