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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 52 · 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) True (b) False
  2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  3. 3.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
  5. 5.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  6. 6.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  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 usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  9. 9.🦾 A servo moves from 140° to 40°. How many degrees does it turn?
  10. 10.🦾 A servo moves from 40° to 70°. How many degrees does it turn?
  11. 11.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
  12. 12.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  13. 13.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
  14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  15. 15.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
  16. 16.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  18. 18.🦾 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 straight up (b) points up and left (c) points up and right (d) points right
  19. 19.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
  20. 20.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  22. 22.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
  23. 23.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
  24. 24.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 40
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  25. 25.🦾 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 straight up (c) points up and right (d) points up and left
  26. 26.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  27. 27.🦾 A servo moves from 110° to 30°. How many degrees does it turn?
  28. 28.🦾 A servo moves from 20° to 40°. How many degrees does it turn?
  29. 29.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  31. 31.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  32. 32.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  33. 33.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  34. 34.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  36. 36.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  38. 38.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle + 10
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 A servo program runs:
    angle = 50
    angle = angle + 50
    angle = angle − 60
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. True
  2. a servo motor
  3. 100
  4. a DC motor
  5. False
  6. False
  7. a servo motor
  8. a servo motor
  9. 100
  10. 30
  11. 10
  12. 80
  13. 60
  14. 150
  15. 180°
  16. False
  17. a DC motor
  18. points up and right
  19. a servo motor
  20. 120
  21. 300
  22. movement
  23. swap its two wires
  24. 160
  25. points right
  26. True
  27. 80
  28. 20
  29. 50
  30. 50
  31. 50
  32. False
  33. False
  34. 170
  35. a servo motor
  36. a DC motor
  37. 100
  38. 70
  39. 50
  40. 100

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