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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 812 · 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 0°. Where does the arm point? (a) points straight up (b) points right (c) points up and left (d) points up and right
  2. 2.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 20
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  3. 3.🦾 A servo program runs:
    angle = 80
    angle = angle + 30
    angle = angle − 50
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  4. 4.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
  5. 5.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  6. 6.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  9. 9.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
  10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  11. 11.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
  12. 12.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  13. 13.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  14. 14.🦾 A servo moves from 120° to 170°. How many degrees does it turn?
  15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  16. 16.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  17. 17.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
  19. 19.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  20. 20.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 40
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  21. 21.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  23. 23.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  25. 25.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  26. 26.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  27. 27.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  28. 28.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  29. 29.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
  30. 30.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  32. 32.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  33. 33.⚙️ 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
  34. 34.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 60
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  35. 35.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  37. 37.🦾 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 up and right (b) points straight up (c) points up and left (d) points right
  38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 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 up and left (b) points right (c) points up and right (d) points left
  40. 40.🦾 A servo moves from 10° to 150°. How many degrees does it turn?

Answer key

  1. points right
  2. 50
  3. 30
  4. 180°
  5. a servo motor
  6. a DC motor
  7. a servo motor
  8. a DC motor
  9. movement
  10. False
  11. swap its two wires
  12. True
  13. True
  14. 50
  15. 50
  16. 120
  17. False
  18. a DC motor
  19. a servo motor
  20. 40
  21. True
  22. 250
  23. False
  24. 300
  25. False
  26. False
  27. True
  28. True
  29. 60
  30. a servo motor
  31. a DC motor
  32. 20
  33. a servo motor
  34. 40
  35. False
  36. a DC motor
  37. points up and right
  38. 80
  39. points left
  40. 140

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