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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 484 · 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: “spins faster with more V” is true of a servo motor. (a) True (b) False
  2. 2.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  3. 3.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  4. 4.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  5. 5.🦾 A servo moves from 120° to 10°. How many degrees does it turn?
  6. 6.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  7. 7.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
  8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  9. 9.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 20
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  10. 10.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
  11. 11.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  12. 12.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  13. 13.🦾 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 right (c) points straight up (d) points left
  14. 14.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 A servo moves from 170° to 100°. How many degrees does it turn?
  16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
  17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  18. 18.🦾 A servo program runs:
    angle = 150
    angle = angle + 30
    angle = angle − 20
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  19. 19.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  20. 20.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  22. 22.🦾 A servo moves from 80° to 30°. How many degrees does it turn?
  23. 23.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
  24. 24.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  25. 25.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo moves from 180° to 110°. How many degrees does it turn?
  27. 27.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  31. 31.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  32. 32.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  34. 34.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  35. 35.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  36. 36.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 40
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 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 right (b) points straight up (c) points left (d) points up and left
  38. 38.🦾 A servo program runs:
    angle = 60
    angle = angle + 20
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  39. 39.⚙️ 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
  40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

Answer key

  1. False
  2. False
  3. False
  4. False
  5. 110
  6. a DC motor
  7. 180°
  8. a servo motor
  9. 0
  10. movement
  11. 140
  12. True
  13. points left
  14. 170
  15. 70
  16. a DC motor
  17. a DC motor
  18. 180
  19. a servo motor
  20. a servo motor
  21. a DC motor
  22. 50
  23. 160
  24. False
  25. 10
  26. 70
  27. 80
  28. 100
  29. 50
  30. 80
  31. a servo motor
  32. True
  33. a servo motor
  34. True
  35. True
  36. 70
  37. points straight up
  38. 90
  39. a servo motor
  40. 150

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