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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 132 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  2. 2.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
  3. 3.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  4. 4.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  5. 5.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
  6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
  7. 7.🦾 A servo moves from 160° to 110°. How many degrees does it turn?
  8. 8.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  9. 9.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  10. 10.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  11. 11.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 10
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  12. 12.🦾 A servo moves from 180° to 130°. How many degrees does it turn?
  13. 13.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
  14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  15. 15.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  16. 16.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  17. 17.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  19. 19.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  21. 21.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  22. 22.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
  23. 23.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
  24. 24.🦾 A servo moves from 160° to 150°. How many degrees does it turn?
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  27. 27.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle + 50
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  28. 28.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  29. 29.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
  30. 30.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  31. 31.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
  32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  33. 33.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  34. 34.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  35. 35.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  37. 37.🦾 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 up and right (b) points left (c) points up and left (d) points right
  38. 38.🦾 A servo moves from 60° to 0°. How many degrees does it turn?
  39. 39.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  40. 40.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer

Answer key

  1. 250
  2. swap its two wires
  3. a DC motor
  4. True
  5. movement
  6. a servo motor
  7. 50
  8. 170
  9. a DC motor
  10. True
  11. 130
  12. 50
  13. points right
  14. a DC motor
  15. 110
  16. False
  17. True
  18. 200
  19. 100
  20. 150
  21. False
  22. points straight up
  23. True
  24. 10
  25. 300
  26. 50
  27. 180
  28. False
  29. False
  30. False
  31. 180°
  32. 90
  33. False
  34. a servo motor
  35. a servo motor
  36. 100
  37. points left
  38. 60
  39. a DC motor
  40. a DC motor

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