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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 660 · 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: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  2. 2.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  3. 3.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  5. 5.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  6. 6.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  7. 7.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
  8. 8.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
  9. 9.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 60
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  12. 12.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  13. 13.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  14. 14.🦾 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 left (c) points straight up (d) points up and right
  15. 15.🦾 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 right (b) points right (c) points left (d) points straight up
  16. 16.🦾 A servo moves from 90° to 170°. How many degrees does it turn?
  17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
  18. 18.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  19. 19.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  21. 21.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
  22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  23. 23.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle − 10
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 A servo moves from 50° to 170°. How many degrees does it turn?
  25. 25.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  26. 26.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  27. 27.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
  28. 28.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  29. 29.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  30. 30.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  31. 31.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
  32. 32.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  34. 34.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
  35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  36. 36.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 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 right (d) points up and left
  38. 38.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  39. 39.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  40. 40.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True

Answer key

  1. False
  2. 100
  3. True
  4. 150
  5. False
  6. False
  7. swap its two wires
  8. 100
  9. 80
  10. 250
  11. a servo motor
  12. True
  13. False
  14. points left
  15. points straight up
  16. 80
  17. a DC motor
  18. False
  19. 180°
  20. 100
  21. 20
  22. a DC motor
  23. 50
  24. 120
  25. 120
  26. False
  27. movement
  28. False
  29. True
  30. a DC motor
  31. 60
  32. True
  33. a DC motor
  34. 150
  35. a servo motor
  36. 80
  37. points right
  38. 80
  39. a DC motor
  40. True

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