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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 78 · 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 common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
  2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  3. 3.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  4. 4.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  5. 5.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  6. 6.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle + 40
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  8. 8.🦾 A servo moves from 30° to 60°. How many degrees does it turn?
  9. 9.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  11. 11.🦾 A servo moves from 120° to 90°. How many degrees does it turn?
  12. 12.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
  14. 14.⚙️ 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
  15. 15.🦾 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 left (b) points up and left (c) points straight up (d) points up and right
  16. 16.🦾 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 up and right (d) points right
  17. 17.🦾 A servo moves from 140° to 110°. How many degrees does it turn?
  18. 18.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
  19. 19.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  20. 20.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  21. 21.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  22. 22.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  24. 24.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  25. 25.🦾 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 straight up (b) points up and left (c) points up and right (d) points right
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  27. 27.🦾 A servo program runs:
    angle = 60
    angle = angle + 50
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 A servo moves from 170° to 70°. How many degrees does it turn?
  29. 29.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  31. 31.⚙️ 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
  32. 32.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  33. 33.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 A servo moves from 160° to 50°. How many degrees does it turn?
  35. 35.🦾 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 up and right (c) points up and left (d) points left
  36. 36.🦾 A servo moves from 20° to 100°. How many degrees does it turn?
  37. 37.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  38. 38.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  39. 39.🦾 A servo moves from 140° to 130°. How many degrees does it turn?
  40. 40.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

Answer key

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

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