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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 202 · 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.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  2. 2.🦾 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
  3. 3.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  5. 5.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  6. 6.🦾 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 up and left (c) points right (d) points left
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  9. 9.⚙️ 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
  10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  11. 11.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  12. 12.🦾 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 right (c) points straight up (d) points left
  13. 13.🦾 A servo moves from 160° to 80°. How many degrees does it turn?
  14. 14.🦾 A servo moves from 0° to 120°. How many degrees does it turn?
  15. 15.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
  16. 16.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  17. 17.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
  18. 18.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
  19. 19.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle + 20
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  20. 20.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
  21. 21.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  22. 22.🦾 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 right (b) points up and left (c) points straight up (d) points left
  23. 23.True or false: “has just two wires” is true of a servo 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.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  27. 27.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  28. 28.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  29. 29.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  30. 30.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  34. 34.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
  35. 35.🦾 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 right (c) points straight up (d) points left
  36. 36.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  37. 37.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  40. 40.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor

Answer key

  1. a DC motor
  2. points straight up
  3. 170
  4. 300
  5. True
  6. points right
  7. 50
  8. a DC motor
  9. a DC motor
  10. False
  11. a servo motor
  12. points up and right
  13. 80
  14. 120
  15. 50
  16. True
  17. 20
  18. 180°
  19. 90
  20. swap its two wires
  21. True
  22. points left
  23. False
  24. a servo motor
  25. False
  26. a DC motor
  27. a servo motor
  28. False
  29. a DC motor
  30. a servo motor
  31. 200
  32. 90
  33. 100
  34. movement
  35. points up and left
  36. False
  37. True
  38. 100
  39. a DC motor
  40. a servo motor

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