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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 4 · 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 right (b) points up and right (c) points up and left (d) points straight up
  2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  4. 4.🦾 A servo moves from 170° to 80°. How many degrees does it turn?
  5. 5.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  6. 6.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  7. 7.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  8. 8.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 20
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  9. 9.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  10. 10.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  11. 11.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  12. 12.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  13. 13.🦾 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 left (b) points right (c) points up and right (d) points up and left
  14. 14.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  15. 15.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
  18. 18.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
  19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 20
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  22. 22.🦾 A servo moves from 120° to 70°. How many degrees does it turn?
  23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  25. 25.🦾 A servo moves from 90° to 60°. How many degrees does it turn?
  26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  27. 27.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  28. 28.🦾 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 straight up (c) points right (d) points up and left
  29. 29.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 20
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo moves from 10° to 90°. How many degrees does it turn?
  31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  32. 32.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  33. 33.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  34. 34.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  35. 35.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
  36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
  37. 37.🦾 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 straight up (b) points up and right (c) points left (d) points right
  38. 38.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  39. 39.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  40. 40.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water

Answer key

  1. points up and right
  2. 50
  3. 150
  4. 90
  5. a servo motor
  6. True
  7. True
  8. 10
  9. a servo motor
  10. False
  11. False
  12. False
  13. points right
  14. 50
  15. True
  16. a DC motor
  17. a DC motor
  18. 180°
  19. 30
  20. 50
  21. a DC motor
  22. 50
  23. a servo motor
  24. a DC motor
  25. 30
  26. a DC motor
  27. False
  28. points up and left
  29. 60
  30. 80
  31. a servo motor
  32. False
  33. True
  34. 70
  35. swap its two wires
  36. a servo motor
  37. points left
  38. 70
  39. True
  40. movement

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