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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 133 · 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 program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 20
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  2. 2.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  3. 3.🦾 A servo moves from 20° to 70°. How many degrees does it turn?
  4. 4.🦾 A servo program runs:
    angle = 90
    angle = angle + 30
    angle = angle + 30
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  5. 5.🦾 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 up and left (d) points right
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  7. 7.🦾 A servo moves from 0° to 130°. How many degrees does it turn?
  8. 8.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  9. 9.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
  10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
  11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  12. 12.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
  13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
  14. 14.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
  15. 15.🦾 A servo moves from 80° to 70°. How many degrees does it turn?
  16. 16.🦾 A servo moves from 130° to 50°. How many degrees does it turn?
  17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  18. 18.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  19. 19.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  21. 21.🦾 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 right (b) points up and left (c) points left (d) points straight up
  22. 22.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  23. 23.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 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 left (c) points right (d) points up and right
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  26. 26.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  27. 27.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  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 left (c) points right (d) points straight up
  29. 29.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  31. 31.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  32. 32.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  33. 33.🦾 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 right (b) points straight up (c) points up and left (d) points left
  34. 34.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  35. 35.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  36. 36.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  37. 37.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  38. 38.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  39. 39.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
  40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

Answer key

  1. 140
  2. True
  3. 50
  4. 150
  5. points straight up
  6. 250
  7. 130
  8. a servo motor
  9. swap its two wires
  10. a DC motor
  11. a DC motor
  12. 180°
  13. a servo motor
  14. 40
  15. 10
  16. 80
  17. a servo motor
  18. False
  19. True
  20. a DC motor
  21. points up and right
  22. 30
  23. 180
  24. points up and left
  25. 50
  26. a DC motor
  27. a servo motor
  28. points right
  29. 110
  30. a DC motor
  31. False
  32. False
  33. points left
  34. False
  35. True
  36. True
  37. True
  38. False
  39. movement
  40. 150

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