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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 877 · 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 servo motor. (a) True (b) False
  2. 2.🦾 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 straight up (c) points left (d) points up and right
  3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
  5. 5.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  6. 6.🦾 A servo moves from 160° to 180°. How many degrees does it turn?
  7. 7.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
  8. 8.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  9. 9.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  11. 11.🦾 A servo moves from 40° to 170°. How many degrees does it turn?
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  13. 13.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  14. 14.🦾 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 left (c) points up and left (d) points right
  15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  16. 16.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 40
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  17. 17.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  19. 19.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  21. 21.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  22. 22.🦾 A servo moves from 10° to 60°. How many degrees does it turn?
  23. 23.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
  24. 24.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  25. 25.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
  27. 27.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  28. 28.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  29. 29.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  30. 30.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  31. 31.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 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 right (b) points up and right (c) points straight up (d) points up and left
  33. 33.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  34. 34.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle − 20
    angle = angle + 60
    angle = angle − 40
    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) False (b) True
  36. 36.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  37. 37.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
  38. 38.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 50
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  39. 39.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False

Answer key

  1. False
  2. points up and right
  3. a servo motor
  4. a DC motor
  5. 110
  6. 20
  7. swap its two wires
  8. False
  9. a servo motor
  10. a DC motor
  11. 130
  12. 50
  13. 20
  14. points right
  15. a DC motor
  16. 10
  17. 180°
  18. 250
  19. True
  20. 200
  21. True
  22. 50
  23. movement
  24. a servo motor
  25. 60
  26. 100
  27. False
  28. False
  29. False
  30. a servo motor
  31. 120
  32. points straight up
  33. False
  34. 120
  35. True
  36. 70
  37. a servo motor
  38. 80
  39. a DC motor
  40. True

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