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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 485 · 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.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  2. 2.🦾 A servo moves from 160° to 110°. How many degrees does it turn?
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
  5. 5.🦾 A servo moves from 60° to 130°. How many degrees does it turn?
  6. 6.⚙️ 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
  7. 7.🦾 A servo moves from 80° to 180°. How many degrees does it turn?
  8. 8.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  11. 11.⚙️ DC motor or servo motor: which one has a signal wire? (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 0°. Where does the arm point? (a) points right (b) points left (c) points up and left (d) points up and right
  13. 13.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
  14. 14.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  15. 15.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle − 30
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  16. 16.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
  18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  19. 19.🦾 A servo moves from 110° to 160°. How many degrees does it turn?
  20. 20.🦾 A servo moves from 30° to 130°. How many degrees does it turn?
  21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  22. 22.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
  23. 23.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  24. 24.🦾 A servo moves from 150° to 50°. How many degrees does it turn?
  25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  26. 26.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  27. 27.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  28. 28.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  29. 29.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  30. 30.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  31. 31.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  32. 32.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
  33. 33.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  38. 38.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 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 right (c) points up and left (d) points up and right

Answer key

  1. a DC motor
  2. 50
  3. 100
  4. a servo motor
  5. 70
  6. swap its two wires
  7. 100
  8. a servo motor
  9. a DC motor
  10. False
  11. a servo motor
  12. points right
  13. 180°
  14. True
  15. 30
  16. 130
  17. a DC motor
  18. a DC motor
  19. 50
  20. 100
  21. a DC motor
  22. movement
  23. False
  24. 100
  25. a servo motor
  26. 140
  27. False
  28. 100
  29. False
  30. a DC motor
  31. False
  32. 160
  33. True
  34. 50
  35. 80
  36. True
  37. 200
  38. 80
  39. 160
  40. points up and left

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