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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 162 · 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: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  2. 2.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  3. 3.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 30
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  4. 4.🦾 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 right (c) points straight up (d) points left
  5. 5.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  7. 7.🦾 A servo moves from 100° to 0°. How many degrees does it turn?
  8. 8.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
  9. 9.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  10. 10.🦾 A servo moves from 100° to 90°. How many degrees does it turn?
  11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  12. 12.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  13. 13.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
  15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  16. 16.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
  17. 17.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  18. 18.🦾 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 up and left (b) points straight up (c) points right (d) points up and right
  19. 19.🦾 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 left (c) points up and right (d) points left
  20. 20.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
  21. 21.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  22. 22.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
  23. 23.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  24. 24.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  25. 25.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  27. 27.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  28. 28.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  29. 29.🦾 A servo moves from 60° to 100°. How many degrees does it turn?
  30. 30.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  31. 31.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 30
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  34. 34.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
  35. 35.🦾 A servo moves from 60° to 0°. How many degrees does it turn?
  36. 36.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  37. 37.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  38. 38.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  39. 39.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  40. 40.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False

Answer key

  1. False
  2. True
  3. 20
  4. points right
  5. True
  6. a DC motor
  7. 100
  8. 180°
  9. False
  10. 10
  11. a DC motor
  12. 150
  13. False
  14. a DC motor
  15. a servo motor
  16. 60
  17. False
  18. points up and left
  19. points up and right
  20. movement
  21. 130
  22. 40
  23. a DC motor
  24. 30
  25. swap its two wires
  26. 100
  27. 30
  28. a servo motor
  29. 40
  30. True
  31. 100
  32. a DC motor
  33. 50
  34. a servo motor
  35. 60
  36. a servo motor
  37. 100
  38. False
  39. 30
  40. False

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