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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 197 · 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 = 100
    angle = angle + 40
    angle = angle − 30
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  3. 3.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  4. 4.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  5. 5.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
  7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  8. 8.🦾 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 up and left (d) points right
  9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  10. 10.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle + 10
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  11. 11.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  13. 13.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  14. 14.🦾 A servo moves from 10° to 110°. How many degrees does it turn?
  15. 15.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
  16. 16.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 50
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo moves from 150° to 80°. How many degrees does it turn?
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  19. 19.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
  21. 21.🦾 A servo moves from 140° to 110°. How many degrees does it turn?
  22. 22.🦾 A servo moves from 40° to 0°. How many degrees does it turn?
  23. 23.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  24. 24.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  25. 25.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  26. 26.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  27. 27.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
  28. 28.🦾 A servo program runs:
    angle = 100
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  29. 29.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  30. 30.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 60
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  31. 31.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  32. 32.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle − 60
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  33. 33.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  34. 34.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle − 60
    angle = angle − 10
    angle = angle + 10
    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 90°. Where does the arm point? (a) points left (b) points up and left (c) points right (d) points straight up
  36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  37. 37.🦾 A servo moves from 120° to 130°. How many degrees does it turn?
  38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  39. 39.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  40. 40.🦾 A servo moves from 50° to 10°. How many degrees does it turn?

Answer key

  1. 150
  2. a servo motor
  3. True
  4. False
  5. False
  6. a servo motor
  7. a DC motor
  8. points right
  9. 200
  10. 80
  11. True
  12. a DC motor
  13. a servo motor
  14. 100
  15. movement
  16. 30
  17. 70
  18. 50
  19. False
  20. a DC motor
  21. 30
  22. 40
  23. True
  24. True
  25. a DC motor
  26. False
  27. 180°
  28. 130
  29. False
  30. 90
  31. a DC motor
  32. 10
  33. True
  34. 50
  35. points straight up
  36. 150
  37. 10
  38. 20
  39. True
  40. 40

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