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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 729 · 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 spins round and round? (a) a servo motor (b) a DC motor
  2. 2.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
  3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  4. 4.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  5. 5.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  6. 6.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle + 20
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  7. 7.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
  8. 8.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  9. 9.🦾 A servo program runs:
    angle = 100
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  10. 10.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
  11. 11.🦾 A servo moves from 180° to 170°. How many degrees does it turn?
  12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
  14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  15. 15.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  16. 16.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
  17. 17.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  18. 18.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  20. 20.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
  21. 21.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  22. 22.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  24. 24.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
  26. 26.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  27. 27.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  28. 28.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  29. 29.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  31. 31.🦾 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 straight up (b) points right (c) points up and right (d) points left
  32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  33. 33.🦾 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 left (b) points right (c) points straight up (d) points up and left
  34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  35. 35.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  37. 37.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo moves from 170° to 60°. How many degrees does it turn?
  39. 39.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  40. 40.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a DC motor
  2. 60
  3. a DC motor
  4. True
  5. False
  6. 140
  7. swap its two wires
  8. 80
  9. 90
  10. movement
  11. 10
  12. True
  13. a servo motor
  14. a servo motor
  15. True
  16. 120
  17. False
  18. a servo motor
  19. 200
  20. 180°
  21. True
  22. False
  23. a servo motor
  24. a servo motor
  25. a DC motor
  26. 40
  27. 120
  28. False
  29. 150
  30. 50
  31. points up and right
  32. 300
  33. points left
  34. 150
  35. 80
  36. False
  37. 180
  38. 110
  39. a DC motor
  40. 100

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