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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 758 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  2. 2.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  3. 3.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  4. 4.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  5. 5.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  8. 8.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  9. 9.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle − 30
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
  11. 11.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
  12. 12.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  13. 13.🦾 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 left (b) points straight up (c) points up and right (d) points up and left
  14. 14.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
  15. 15.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  17. 17.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  20. 20.🦾 A servo moves from 110° to 100°. How many degrees does it turn?
  21. 21.True or false: “has just two wires” is true of a servo 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 right (c) points left (d) points straight up
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  24. 24.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  25. 25.🦾 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 left (c) points left (d) points straight up
  26. 26.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
  27. 27.🦾 A servo moves from 20° to 70°. How many degrees does it turn?
  28. 28.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  29. 29.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 30
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  32. 32.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
  34. 34.🦾 A servo program runs:
    angle = 140
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  35. 35.🦾 A servo moves from 0° to 130°. How many degrees does it turn?
  36. 36.🦾 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 straight up
  37. 37.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
  38. 38.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  39. 39.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. 100
  2. False
  3. True
  4. False
  5. False
  6. a DC motor
  7. 50
  8. False
  9. 80
  10. a servo motor
  11. movement
  12. a servo motor
  13. points up and left
  14. 180°
  15. True
  16. a DC motor
  17. True
  18. a servo motor
  19. a DC motor
  20. 10
  21. False
  22. points left
  23. 250
  24. True
  25. points right
  26. 60
  27. 50
  28. False
  29. 60
  30. 40
  31. 150
  32. False
  33. a DC motor
  34. 70
  35. 130
  36. points up and right
  37. swap its two wires
  38. False
  39. 120
  40. 110

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