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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 68 · 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: “holds a set angle” is true of a DC motor. (a) True (b) False
  2. 2.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  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 right (b) points up and right (c) points up and left (d) points left
  5. 5.🦾 A servo moves from 130° to 70°. How many degrees does it turn?
  6. 6.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  7. 7.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  8. 8.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  9. 9.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  10. 10.🦾 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 left (b) points straight up (c) points up and right (d) points up and left
  11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  12. 12.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  13. 13.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  15. 15.⚙️ 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
  16. 16.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  17. 17.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  21. 21.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  23. 23.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
  24. 24.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
  25. 25.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  27. 27.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  28. 28.🦾 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 left (b) points right (c) points up and right (d) points up and left
  29. 29.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
  30. 30.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  31. 31.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 10
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 A servo program runs:
    angle = 60
    angle = angle + 60
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  34. 34.🦾 A servo moves from 110° to 70°. How many degrees does it turn?
  35. 35.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
  36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  38. 38.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  39. 39.🦾 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 straight up (b) points up and left (c) points left (d) points up and right
  40. 40.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. False
  2. a DC motor
  3. 250
  4. points right
  5. 60
  6. True
  7. 140
  8. True
  9. a servo motor
  10. points straight up
  11. a DC motor
  12. 100
  13. False
  14. a servo motor
  15. a servo motor
  16. False
  17. True
  18. True
  19. a DC motor
  20. 100
  21. 150
  22. True
  23. 80
  24. movement
  25. a DC motor
  26. a servo motor
  27. False
  28. points up and right
  29. a DC motor
  30. True
  31. 120
  32. 80
  33. a servo motor
  34. 40
  35. 180°
  36. 10
  37. 50
  38. False
  39. points up and left
  40. 120

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