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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 618 · 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 = 170
    angle = angle + 10
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
  3. 3.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
  4. 4.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  5. 5.🦾 A servo moves from 50° to 0°. How many degrees does it turn?
  6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  7. 7.🦾 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 right (c) points up and right (d) points left
  8. 8.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
  9. 9.⚙️ 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
  10. 10.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  13. 13.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  14. 14.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
  15. 15.🦾 A servo moves from 10° to 110°. How many degrees does it turn?
  16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  17. 17.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  18. 18.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  19. 19.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  20. 20.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle − 60
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
  25. 25.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo moves from 100° to 140°. How many degrees does it turn?
  27. 27.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  28. 28.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  29. 29.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  31. 31.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  32. 32.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  33. 33.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  34. 34.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
  35. 35.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle − 30
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 40
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 50
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  39. 39.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  40. 40.🦾 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 straight up (d) points left

Answer key

  1. 140
  2. 10
  3. 180°
  4. 30
  5. 50
  6. a servo motor
  7. points up and right
  8. swap its two wires
  9. a servo motor
  10. True
  11. a DC motor
  12. a servo motor
  13. False
  14. 20
  15. 100
  16. a DC motor
  17. False
  18. True
  19. False
  20. 10
  21. a servo motor
  22. 300
  23. a DC motor
  24. a DC motor
  25. 80
  26. 40
  27. 110
  28. True
  29. 80
  30. 10
  31. True
  32. True
  33. 100
  34. movement
  35. False
  36. 140
  37. 60
  38. 120
  39. a DC motor
  40. points right

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