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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 161 · 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.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  2. 2.⚙️ 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
  3. 3.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  4. 4.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
  5. 5.🦾 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 left (b) points left (c) points right (d) points straight up
  6. 6.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  7. 7.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
  8. 8.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
  9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  10. 10.🦾 A servo program runs:
    angle = 120
    angle = angle + 30
    angle = angle + 10
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  11. 11.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  13. 13.🦾 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 right (d) points up and left
  14. 14.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
  15. 15.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  17. 17.🦾 A servo moves from 120° to 60°. How many degrees does it turn?
  18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  19. 19.🦾 A servo moves from 150° to 180°. How many degrees does it turn?
  20. 20.🦾 A servo moves from 150° to 110°. How many degrees does it turn?
  21. 21.🦾 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 straight up (c) points up and right (d) points up and left
  22. 22.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
  23. 23.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  25. 25.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 60
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  27. 27.🦾 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 straight up (b) points up and left (c) points left (d) points right
  28. 28.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  29. 29.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  30. 30.⚙️ 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
  31. 31.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 50
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  32. 32.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  35. 35.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  36. 36.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  37. 37.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 60
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  39. 39.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  40. 40.🦾 A servo moves from 180° to 140°. How many degrees does it turn?

Answer key

  1. True
  2. swap its two wires
  3. a servo motor
  4. 180°
  5. points right
  6. 150
  7. movement
  8. True
  9. a DC motor
  10. 100
  11. 90
  12. a servo motor
  13. points left
  14. 90
  15. True
  16. 200
  17. 60
  18. a DC motor
  19. 30
  20. 40
  21. points up and left
  22. 150
  23. False
  24. 50
  25. 150
  26. 60
  27. points straight up
  28. False
  29. True
  30. a DC motor
  31. 70
  32. a DC motor
  33. a DC motor
  34. True
  35. False
  36. a DC motor
  37. 90
  38. a servo motor
  39. True
  40. 40

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