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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 831 · 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.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  2. 2.🦾 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 right (d) points up and right
  3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  4. 4.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    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 DC motor (b) a servo motor
  6. 6.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
  7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  8. 8.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  11. 11.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
  13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
  14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  16. 16.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  17. 17.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  18. 18.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  20. 20.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  21. 21.🦾 A servo program runs:
    angle = 110
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  22. 22.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  23. 23.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 A servo moves from 40° to 70°. How many degrees does it turn?
  25. 25.🦾 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 left (b) points up and right (c) points right (d) points left
  26. 26.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  27. 27.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 20
    angle = angle + 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 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 left (c) points straight up (d) points up and left
  30. 30.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  32. 32.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
  33. 33.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  36. 36.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  39. 39.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
  40. 40.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a DC motor
  2. points up and right
  3. a servo motor
  4. 140
  5. a servo motor
  6. 180°
  7. a servo motor
  8. a DC motor
  9. a DC motor
  10. 50
  11. False
  12. a servo motor
  13. a DC motor
  14. 200
  15. a DC motor
  16. True
  17. False
  18. False
  19. False
  20. a servo motor
  21. 40
  22. True
  23. 80
  24. 30
  25. points left
  26. True
  27. True
  28. 140
  29. points up and left
  30. False
  31. 300
  32. swap its two wires
  33. 100
  34. 100
  35. a servo motor
  36. False
  37. 150
  38. a DC motor
  39. movement
  40. 40

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