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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 190 · 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 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 right (b) points right (c) points straight up (d) points up and left
  2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  3. 3.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
  4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  5. 5.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  6. 6.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 10
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
  9. 9.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
  10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  11. 11.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
  12. 12.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  13. 13.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  15. 15.🦾 A servo program runs:
    angle = 110
    angle = angle + 40
    angle = angle − 50
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
  17. 17.🦾 A servo moves from 90° to 80°. How many degrees does it turn?
  18. 18.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  19. 19.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo moves from 130° to 50°. How many degrees does it turn?
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  22. 22.🦾 A servo moves from 10° to 30°. How many degrees does it turn?
  23. 23.🦾 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 right (b) points right (c) points left (d) points up and left
  24. 24.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  27. 27.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  28. 28.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  29. 29.🦾 A servo moves from 60° to 30°. How many degrees does it turn?
  30. 30.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  31. 31.🦾 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 left (b) points up and right (c) points right (d) points straight up
  32. 32.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  34. 34.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
  35. 35.🦾 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 right (d) points straight up
  36. 36.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  37. 37.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  38. 38.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?

Answer key

  1. points up and right
  2. a DC motor
  3. swap its two wires
  4. a servo motor
  5. False
  6. 130
  7. a DC motor
  8. a DC motor
  9. movement
  10. a DC motor
  11. 40
  12. True
  13. a servo motor
  14. a DC motor
  15. 90
  16. a servo motor
  17. 10
  18. False
  19. 150
  20. 80
  21. 250
  22. 20
  23. points left
  24. True
  25. a servo motor
  26. a servo motor
  27. 80
  28. True
  29. 30
  30. a DC motor
  31. points right
  32. False
  33. 50
  34. 180°
  35. points straight up
  36. True
  37. a servo motor
  38. False
  39. 150
  40. 100

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