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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 310 · 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: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  2. 2.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
  3. 3.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
  4. 4.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
  5. 5.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  6. 6.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  7. 7.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  8. 8.🦾 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 right (b) points straight up (c) points left (d) points right
  9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  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 up and right (d) points up and left
  11. 11.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  12. 12.🦾 A servo program runs:
    angle = 60
    angle = angle + 10
    angle = angle − 10
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  14. 14.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  15. 15.🦾 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 straight up (b) points up and right (c) points left (d) points right
  16. 16.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
  18. 18.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  19. 19.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  21. 21.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 20
    angle = angle + 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  22. 22.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  23. 23.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  24. 24.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
  25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
  26. 26.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
  27. 27.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 40
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  31. 31.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  34. 34.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  35. 35.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  36. 36.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo moves from 120° to 160°. How many degrees does it turn?
  38. 38.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  39. 39.🦾 A servo moves from 70° to 40°. How many degrees does it turn?
  40. 40.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. True
  2. swap its two wires
  3. movement
  4. 180°
  5. True
  6. True
  7. a DC motor
  8. points up and right
  9. a servo motor
  10. points right
  11. 90
  12. 160
  13. a servo motor
  14. False
  15. points left
  16. 130
  17. 60
  18. False
  19. False
  20. 250
  21. 180
  22. False
  23. False
  24. 40
  25. a DC motor
  26. a servo motor
  27. False
  28. 130
  29. 60
  30. a DC motor
  31. 50
  32. 150
  33. a servo motor
  34. 30
  35. True
  36. 10
  37. 40
  38. False
  39. 30
  40. 30

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