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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 450 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  2. 2.⚙️ 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
  3. 3.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  4. 4.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
  5. 5.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
  7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
  8. 8.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  9. 9.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  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 straight up (b) points up and left (c) points up and right (d) points right
  11. 11.🦾 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 right (b) points up and left (c) points up and right (d) points straight up
  12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  13. 13.🦾 A servo moves from 110° to 170°. How many degrees does it turn?
  14. 14.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  15. 15.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  17. 17.🦾 A servo program runs:
    angle = 130
    angle = angle − 30
    angle = angle − 50
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  19. 19.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  20. 20.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  23. 23.🦾 A servo moves from 70° to 100°. How many degrees does it turn?
  24. 24.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  25. 25.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  27. 27.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  28. 28.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  30. 30.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  31. 31.🦾 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 left
  32. 32.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  33. 33.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
  34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  35. 35.🦾 A servo moves from 10° to 20°. How many degrees does it turn?
  36. 36.🦾 A servo moves from 40° to 110°. How many degrees does it turn?
  37. 37.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo moves from 160° to 70°. How many degrees does it turn?
  39. 39.🦾 A servo moves from 0° to 70°. How many degrees does it turn?
  40. 40.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 60
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. 50
  2. swap its two wires
  3. True
  4. 180°
  5. False
  6. a DC motor
  7. a servo motor
  8. False
  9. True
  10. points right
  11. points up and left
  12. a DC motor
  13. 60
  14. a DC motor
  15. 80
  16. a DC motor
  17. 140
  18. True
  19. 90
  20. a servo motor
  21. a DC motor
  22. 200
  23. 30
  24. False
  25. 40
  26. a DC motor
  27. False
  28. a servo motor
  29. a servo motor
  30. True
  31. points straight up
  32. True
  33. movement
  34. False
  35. 10
  36. 70
  37. 60
  38. 90
  39. 70
  40. 60

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