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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 483 · 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 drives the wheels? (a) a servo motor (b) a DC motor
  2. 2.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
  4. 4.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
  5. 5.🦾 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 left (b) points straight up (c) points up and right (d) points left
  6. 6.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
  8. 8.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  9. 9.🦾 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 up and left (c) points right (d) points up and right
  10. 10.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  11. 11.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
  12. 12.🦾 A servo moves from 80° to 130°. How many degrees does it turn?
  13. 13.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
  14. 14.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  16. 16.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 40
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo moves from 170° to 180°. How many degrees does it turn?
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  19. 19.🦾 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 straight up (c) points up and left (d) points left
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  21. 21.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  22. 22.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
  23. 23.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 A servo program runs:
    angle = 70
    angle = angle − 30
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  25. 25.🦾 A servo program runs:
    angle = 120
    angle = angle − 60
    angle = angle + 40
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  26. 26.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  27. 27.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  28. 28.🦾 A servo moves from 40° to 130°. How many degrees does it turn?
  29. 29.🦾 A servo moves from 50° to 80°. How many degrees does it turn?
  30. 30.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  31. 31.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  32. 32.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  33. 33.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  34. 34.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  35. 35.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  37. 37.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  39. 39.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  40. 40.🦾 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 right (b) points left (c) points up and left (d) points straight up

Answer key

  1. a DC motor
  2. False
  3. a DC motor
  4. 180°
  5. points straight up
  6. False
  7. a servo motor
  8. False
  9. points up and right
  10. 80
  11. 90
  12. 50
  13. swap its two wires
  14. 90
  15. a DC motor
  16. 170
  17. 10
  18. 50
  19. points right
  20. 100
  21. a servo motor
  22. movement
  23. 70
  24. 150
  25. 130
  26. True
  27. False
  28. 90
  29. 30
  30. a servo motor
  31. False
  32. a DC motor
  33. True
  34. a DC motor
  35. 80
  36. False
  37. False
  38. a servo motor
  39. True
  40. points left

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