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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 664 · 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: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  2. 2.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  3. 3.🦾 A servo moves from 90° to 140°. How many degrees does it turn?
  4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  7. 7.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  9. 9.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  11. 11.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
  13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  15. 15.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  16. 16.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  18. 18.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  19. 19.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
  20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
  21. 21.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 10
    angle = angle − 30
    angle = angle − 60
    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 turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  24. 24.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  25. 25.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
  26. 26.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  27. 27.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
  28. 28.🦾 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 right (c) points left (d) points straight up
  29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  30. 30.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  31. 31.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 30
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 A servo program runs:
    angle = 80
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  34. 34.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  35. 35.🦾 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 left (c) points right (d) points straight up
  36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  38. 38.🦾 A servo moves from 10° to 150°. How many degrees does it turn?
  39. 39.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  40. 40.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True

Answer key

  1. True
  2. 80
  3. 50
  4. a DC motor
  5. a DC motor
  6. a servo motor
  7. True
  8. 200
  9. False
  10. 50
  11. False
  12. a servo motor
  13. a DC motor
  14. a servo motor
  15. True
  16. False
  17. a servo motor
  18. a DC motor
  19. swap its two wires
  20. a DC motor
  21. 70
  22. True
  23. 100
  24. False
  25. 180°
  26. True
  27. movement
  28. points right
  29. a servo motor
  30. 20
  31. False
  32. 100
  33. 140
  34. True
  35. points straight up
  36. 40
  37. True
  38. 140
  39. True
  40. True

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