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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 920 · 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 moves from 150° to 50°. How many degrees does it turn?
  2. 2.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  4. 4.🦾 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 up and right (c) points up and left (d) points straight up
  5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
  6. 6.🦾 A servo moves from 100° to 130°. How many degrees does it turn?
  7. 7.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  8. 8.⚙️ 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
  9. 9.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  10. 10.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  11. 11.🦾 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 right (b) points up and left (c) points left (d) points right
  12. 12.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  14. 14.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  15. 15.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
  17. 17.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  18. 18.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
  19. 19.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  21. 21.🦾 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 straight up (b) points right (c) points up and right (d) points left
  22. 22.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  25. 25.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  26. 26.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  27. 27.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 50
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  28. 28.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  29. 29.🦾 A servo moves from 80° to 70°. How many degrees does it turn?
  30. 30.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  31. 31.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  32. 32.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle − 40
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  33. 33.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  35. 35.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle + 40
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  37. 37.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  38. 38.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  39. 39.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?

Answer key

  1. 100
  2. movement
  3. 300
  4. points up and left
  5. a servo motor
  6. 30
  7. False
  8. swap its two wires
  9. a servo motor
  10. True
  11. points left
  12. 140
  13. 150
  14. a servo motor
  15. True
  16. a DC motor
  17. True
  18. 30
  19. 20
  20. a servo motor
  21. points straight up
  22. a DC motor
  23. 50
  24. 100
  25. False
  26. False
  27. 40
  28. False
  29. 10
  30. 140
  31. False
  32. 130
  33. True
  34. False
  35. 170
  36. True
  37. True
  38. True
  39. 40
  40. 250

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