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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 445 · 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.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  2. 2.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  3. 3.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
  4. 4.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 10
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  5. 5.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  6. 6.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  7. 7.🦾 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 left (c) points straight up (d) points left
  8. 8.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
  9. 9.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  10. 10.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  12. 12.🦾 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 right (b) points straight up (c) points up and right (d) points up and left
  13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  15. 15.🦾 A servo moves from 60° to 100°. How many degrees does it turn?
  16. 16.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  17. 17.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  18. 18.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  20. 20.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
  21. 21.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  22. 22.🦾 A servo moves from 0° to 160°. How many degrees does it turn?
  23. 23.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
  24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  25. 25.🦾 A servo moves from 10° to 110°. How many degrees does it turn?
  26. 26.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle − 50
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  29. 29.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  31. 31.⚙️ 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
  32. 32.🦾 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 straight up (b) points left (c) points up and right (d) points right
  33. 33.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  34. 34.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  35. 35.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  37. 37.🦾 A servo program runs:
    angle = 60
    angle = angle − 40
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  38. 38.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  39. 39.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  40. 40.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor

Answer key

  1. False
  2. 100
  3. movement
  4. 50
  5. 50
  6. 120
  7. points right
  8. swap its two wires
  9. False
  10. 140
  11. 300
  12. points straight up
  13. a DC motor
  14. 100
  15. 40
  16. True
  17. 10
  18. a servo motor
  19. a servo motor
  20. 180°
  21. False
  22. 160
  23. 40
  24. a servo motor
  25. 100
  26. 80
  27. a servo motor
  28. 50
  29. a DC motor
  30. 200
  31. a DC motor
  32. points up and right
  33. True
  34. a servo motor
  35. False
  36. 250
  37. 70
  38. a servo motor
  39. False
  40. a DC motor

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