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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 88 · 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.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  2. 2.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
  3. 3.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  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 up and left (b) points right (c) points straight up (d) points up and right
  5. 5.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  6. 6.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  7. 7.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  8. 8.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  9. 9.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
  10. 10.🦾 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 right (b) points left (c) points straight up (d) points up and right
  11. 11.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  12. 12.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  13. 13.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  14. 14.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
  15. 15.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  16. 16.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  18. 18.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle + 20
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  21. 21.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  22. 22.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  24. 24.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  25. 25.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  26. 26.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  27. 27.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
  28. 28.⚙️ 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
  29. 29.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
  30. 30.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  31. 31.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  32. 32.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  33. 33.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  34. 34.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
  35. 35.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  36. 36.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 10
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  38. 38.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  39. 39.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  40. 40.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a DC motor
  2. movement
  3. False
  4. points up and right
  5. 120
  6. True
  7. False
  8. 120
  9. 180°
  10. points right
  11. False
  12. 160
  13. True
  14. swap its two wires
  15. 50
  16. True
  17. 150
  18. 70
  19. 140
  20. a servo motor
  21. False
  22. 20
  23. 200
  24. 30
  25. False
  26. 120
  27. 20
  28. a DC motor
  29. points straight up
  30. a DC motor
  31. True
  32. False
  33. False
  34. a servo motor
  35. a DC motor
  36. 90
  37. True
  38. False
  39. True
  40. 40

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