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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 151 · 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.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
  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) False (b) True
  4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
  5. 5.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 60
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  6. 6.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  7. 7.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  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 left (b) points straight up (c) points up and right (d) points right
  9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  10. 10.🦾 A servo moves from 60° to 70°. How many degrees does it turn?
  11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  12. 12.🦾 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 up and right (d) points straight up
  13. 13.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  15. 15.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
  16. 16.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  18. 18.🦾 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 straight up (b) points up and left (c) points left (d) points right
  19. 19.🦾 A servo program runs:
    angle = 130
    angle = angle − 30
    angle = angle + 60
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  20. 20.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  21. 21.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  22. 22.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  24. 24.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  26. 26.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  27. 27.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 50
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  28. 28.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  29. 29.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
  30. 30.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  32. 32.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle + 40
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  35. 35.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 20
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  37. 37.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a DC motor (d) a buzzer
  38. 38.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  39. 39.🦾 A servo moves from 170° to 40°. How many degrees does it turn?
  40. 40.🦾 A servo moves from 150° to 10°. How many degrees does it turn?

Answer key

  1. swap its two wires
  2. movement
  3. False
  4. a DC motor
  5. 30
  6. True
  7. False
  8. points right
  9. a servo motor
  10. 10
  11. a DC motor
  12. points left
  13. True
  14. 250
  15. 180°
  16. a DC motor
  17. 50
  18. points up and left
  19. 100
  20. False
  21. False
  22. True
  23. 150
  24. a DC motor
  25. a servo motor
  26. True
  27. 30
  28. a servo motor
  29. 90
  30. True
  31. 100
  32. 50
  33. 50
  34. 170
  35. 40
  36. True
  37. a servo motor
  38. False
  39. 130
  40. 140

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