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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 569 · 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 moves from 70° to 120°. How many degrees does it turn?
  2. 2.🦾 A servo moves from 40° to 110°. How many degrees does it turn?
  3. 3.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
  6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  7. 7.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  8. 8.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 60
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  10. 10.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  12. 12.🦾 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 up and right (b) points up and left (c) points straight up (d) points right
  13. 13.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
  14. 14.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  15. 15.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  18. 18.🦾 A servo moves from 10° to 60°. How many degrees does it turn?
  19. 19.⚙️ 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
  20. 20.🦾 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?
  21. 21.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  22. 22.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  23. 23.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  24. 24.🦾 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 up and right (b) points left (c) points straight up (d) points right
  25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  26. 26.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  28. 28.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
  29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  30. 30.🦾 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 up and left (b) points up and right (c) points left (d) points straight up
  31. 31.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  32. 32.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 20
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  33. 33.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  34. 34.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  35. 35.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  36. 36.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  37. 37.🦾 A servo moves from 170° to 60°. How many degrees does it turn?
  38. 38.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
  39. 39.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  40. 40.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle − 60
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. 50
  2. 70
  3. True
  4. a DC motor
  5. a DC motor
  6. a DC motor
  7. a servo motor
  8. 0
  9. a DC motor
  10. False
  11. 250
  12. points right
  13. movement
  14. False
  15. True
  16. a servo motor
  17. a servo motor
  18. 50
  19. a servo motor
  20. 120
  21. True
  22. 20
  23. a DC motor
  24. points straight up
  25. a servo motor
  26. True
  27. 200
  28. 180°
  29. 50
  30. points left
  31. True
  32. 40
  33. True
  34. 120
  35. True
  36. False
  37. 110
  38. swap its two wires
  39. True
  40. 50

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