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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 603 · 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 program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  2. 2.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  4. 4.🦾 A servo moves from 10° to 110°. How many degrees does it turn?
  5. 5.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  6. 6.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 10
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  7. 7.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  8. 8.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  9. 9.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  10. 10.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
  11. 11.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  12. 12.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
  14. 14.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 A servo moves from 120° to 100°. How many degrees does it turn?
  16. 16.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 50
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  18. 18.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  20. 20.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  23. 23.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle − 40
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  25. 25.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
  26. 26.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  27. 27.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
  28. 28.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  29. 29.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
  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 up and left (c) points left (d) points right
  31. 31.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  34. 34.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  35. 35.🦾 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 up and left (c) points straight up (d) points left
  36. 36.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  37. 37.🦾 A servo moves from 50° to 60°. How many degrees does it turn?
  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 180° to 70°. How many degrees does it turn?
  40. 40.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor

Answer key

  1. 40
  2. movement
  3. 300
  4. 100
  5. 90
  6. 100
  7. True
  8. 150
  9. False
  10. 180°
  11. False
  12. False
  13. a servo motor
  14. 20
  15. 20
  16. 20
  17. 200
  18. False
  19. 100
  20. 130
  21. a servo motor
  22. a DC motor
  23. 30
  24. 120
  25. 50
  26. 120
  27. 110
  28. True
  29. a DC motor
  30. points right
  31. 90
  32. a DC motor
  33. a servo motor
  34. 30
  35. points up and left
  36. a DC motor
  37. 10
  38. a servo motor
  39. 110
  40. a DC motor

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