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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 90 · 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.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  3. 3.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle + 20
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  4. 4.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  6. 6.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  7. 7.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
  8. 8.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 40
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  9. 9.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  10. 10.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  11. 11.🦾 A servo moves from 40° to 0°. How many degrees does it turn?
  12. 12.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
  13. 13.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
  14. 14.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  15. 15.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  16. 16.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
  18. 18.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  20. 20.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  21. 21.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  22. 22.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
  23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
  24. 24.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  25. 25.🦾 A servo moves from 100° to 90°. How many degrees does it turn?
  26. 26.🦾 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 straight up (c) points up and right (d) points up and left
  27. 27.🦾 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 right (c) points up and right (d) points up and left
  28. 28.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  29. 29.🦾 A servo moves from 100° to 50°. How many degrees does it turn?
  30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  31. 31.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  33. 33.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  34. 34.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  35. 35.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  36. 36.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  37. 37.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 10
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  39. 39.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  40. 40.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor

Answer key

  1. a DC motor
  2. 50
  3. 0
  4. True
  5. 300
  6. 20
  7. movement
  8. 100
  9. False
  10. False
  11. 40
  12. 180°
  13. swap its two wires
  14. True
  15. True
  16. True
  17. a DC motor
  18. a DC motor
  19. False
  20. False
  21. True
  22. 110
  23. a servo motor
  24. a servo motor
  25. 10
  26. points left
  27. points up and right
  28. a servo motor
  29. 50
  30. False
  31. True
  32. 80
  33. a DC motor
  34. 0
  35. 80
  36. True
  37. 60
  38. 60
  39. a servo motor
  40. a DC motor

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