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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 478 · 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: “spins faster with more V” is true of a servo motor. (a) False (b) True
  2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
  5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  6. 6.🦾 A servo moves from 10° to 0°. How many degrees does it turn?
  7. 7.🦾 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 right (b) points up and right (c) points up and left (d) points left
  8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
  11. 11.🦾 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 left (c) points up and left (d) points right
  12. 12.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  13. 13.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
  14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  16. 16.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  17. 17.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  18. 18.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  20. 20.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
  21. 21.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  23. 23.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  24. 24.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  25. 25.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  28. 28.🦾 A servo moves from 140° to 110°. How many degrees does it turn?
  29. 29.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  31. 31.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  32. 32.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
  33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  34. 34.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  35. 35.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 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 right (b) points straight up (c) points left (d) points right
  37. 37.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo program runs:
    angle = 80
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  39. 39.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  40. 40.🦾 A servo moves from 150° to 130°. How many degrees does it turn?

Answer key

  1. False
  2. 50
  3. a DC motor
  4. a servo motor
  5. a DC motor
  6. 10
  7. points up and left
  8. False
  9. 100
  10. a DC motor
  11. points left
  12. 50
  13. 180°
  14. a DC motor
  15. a servo motor
  16. False
  17. 50
  18. 50
  19. 200
  20. movement
  21. True
  22. True
  23. False
  24. a servo motor
  25. 70
  26. 150
  27. 250
  28. 30
  29. False
  30. a servo motor
  31. True
  32. swap its two wires
  33. a servo motor
  34. True
  35. 110
  36. points right
  37. 90
  38. 150
  39. True
  40. 20

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