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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 16 · 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 motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
  2. 2.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  4. 4.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
  7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  8. 8.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  9. 9.🦾 A servo moves from 90° to 10°. How many degrees does it turn?
  10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  12. 12.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 50
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  13. 13.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
  14. 14.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 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 left (b) points up and right (c) points right (d) points up and left
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  18. 18.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo moves from 100° to 110°. How many degrees does it turn?
  21. 21.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  22. 22.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  23. 23.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
  24. 24.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  25. 25.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  26. 26.⚙️ 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
  27. 27.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 40
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  29. 29.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  30. 30.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  31. 31.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 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 up and left (c) points straight up (d) points right
  34. 34.🦾 A servo moves from 40° to 50°. How many degrees does it turn?
  35. 35.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
  36. 36.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  37. 37.🦾 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 left (b) points up and left (c) points straight up (d) points right
  38. 38.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  39. 39.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  40. 40.🦾 A servo moves from 180° to 120°. How many degrees does it turn?

Answer key

  1. movement
  2. True
  3. 300
  4. False
  5. 200
  6. a servo motor
  7. a DC motor
  8. True
  9. 80
  10. a DC motor
  11. 50
  12. 110
  13. 20
  14. 160
  15. points left
  16. 150
  17. 100
  18. 150
  19. 70
  20. 10
  21. a servo motor
  22. True
  23. 180°
  24. False
  25. a servo motor
  26. a DC motor
  27. a servo motor
  28. 120
  29. True
  30. True
  31. 0
  32. 140
  33. points up and right
  34. 10
  35. swap its two wires
  36. False
  37. points straight up
  38. a servo motor
  39. a DC motor
  40. 60

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