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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 762 · 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 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 left (b) points up and right (c) points up and left (d) points straight up
  2. 2.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  3. 3.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
  4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
  6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
  7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  8. 8.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  9. 9.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  13. 13.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle − 50
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  15. 15.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  16. 16.🦾 A servo moves from 150° to 120°. How many degrees does it turn?
  17. 17.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
  18. 18.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  20. 20.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  22. 22.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  23. 23.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  24. 24.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  25. 25.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  26. 26.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
  27. 27.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  30. 30.🦾 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 straight up (c) points left (d) points up and left
  31. 31.🦾 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 up and left (c) points up and right (d) points right
  32. 32.🦾 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 straight up (b) points right (c) points left (d) points up and right
  33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  34. 34.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
  35. 35.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  37. 37.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  38. 38.🦾 A servo moves from 80° to 70°. How many degrees does it turn?
  39. 39.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 40
    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 120°?

Answer key

  1. points left
  2. True
  3. 180°
  4. a servo motor
  5. a DC motor
  6. a servo motor
  7. a servo motor
  8. False
  9. 0
  10. a servo motor
  11. a DC motor
  12. a DC motor
  13. 150
  14. 100
  15. False
  16. 30
  17. swap its two wires
  18. False
  19. 50
  20. True
  21. 300
  22. True
  23. False
  24. True
  25. False
  26. 40
  27. a servo motor
  28. 80
  29. a DC motor
  30. points straight up
  31. points up and right
  32. points right
  33. a servo motor
  34. movement
  35. 20
  36. False
  37. True
  38. 10
  39. 60
  40. 200

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