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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 933 · 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 = 0
    angle = angle + 10
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  2. 2.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
  3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  4. 4.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  5. 5.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  6. 6.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  8. 8.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
  9. 9.🦾 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 straight up (b) points left (c) points up and right (d) points up and left
  10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
  12. 12.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  13. 13.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  17. 17.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
  18. 18.🦾 A servo program runs:
    angle = 140
    angle = angle − 10
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  19. 19.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  23. 23.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  24. 24.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  25. 25.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 40
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  26. 26.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
  28. 28.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  29. 29.🦾 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 right (c) points right (d) points left
  30. 30.🦾 A servo moves from 100° to 150°. How many degrees does it turn?
  31. 31.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 50
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  32. 32.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo moves from 10° to 100°. How many degrees does it turn?
  37. 37.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  38. 38.🦾 A servo moves from 90° to 160°. How many degrees does it turn?
  39. 39.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle − 30
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 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 straight up (b) points right (c) points left (d) points up and right

Answer key

  1. 120
  2. movement
  3. a servo motor
  4. False
  5. a DC motor
  6. a servo motor
  7. 300
  8. 180°
  9. points up and left
  10. a DC motor
  11. a DC motor
  12. True
  13. 50
  14. a DC motor
  15. a servo motor
  16. a DC motor
  17. swap its two wires
  18. 160
  19. 40
  20. 200
  21. a DC motor
  22. 50
  23. True
  24. True
  25. 100
  26. True
  27. a servo motor
  28. True
  29. points straight up
  30. 50
  31. 40
  32. 70
  33. 100
  34. False
  35. 100
  36. 90
  37. False
  38. 70
  39. 110
  40. points left

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