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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 195 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
  2. 2.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  3. 3.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  4. 4.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  6. 6.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  9. 9.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  10. 10.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  11. 11.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  12. 12.🦾 A servo program runs:
    angle = 120
    angle = angle + 30
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  14. 14.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  16. 16.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
  17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  18. 18.⚙️ 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
  19. 19.🦾 A servo moves from 170° to 90°. How many degrees does it turn?
  20. 20.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  21. 21.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  23. 23.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
  24. 24.🦾 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 right (c) points left (d) points straight up
  25. 25.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  26. 26.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  27. 27.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  28. 28.🦾 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 right (b) points up and left (c) points left (d) points right
  29. 29.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
  30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  31. 31.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  33. 33.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
  34. 34.🦾 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 left (b) points right (c) points straight up (d) points left
  35. 35.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  36. 36.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  37. 37.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  38. 38.🦾 A servo moves from 60° to 110°. How many degrees does it turn?
  39. 39.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 60
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 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 up and left (b) points left (c) points up and right (d) points right

Answer key

  1. a servo motor
  2. a servo motor
  3. False
  4. 160
  5. a servo motor
  6. 90
  7. a DC motor
  8. a DC motor
  9. True
  10. True
  11. a servo motor
  12. 130
  13. a DC motor
  14. False
  15. 200
  16. 180°
  17. a DC motor
  18. a DC motor
  19. 80
  20. False
  21. True
  22. 300
  23. movement
  24. points right
  25. True
  26. True
  27. 70
  28. points up and left
  29. 150
  30. a servo motor
  31. False
  32. 100
  33. swap its two wires
  34. points straight up
  35. True
  36. False
  37. True
  38. 50
  39. 30
  40. points up and right

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