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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 251 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
  2. 2.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  3. 3.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  4. 4.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  6. 6.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
  7. 7.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle − 20
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  8. 8.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
  11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  12. 12.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  13. 13.🦾 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 straight up (c) points up and right (d) points up and left
  14. 14.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  16. 16.🦾 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 right (b) points up and left (c) points right (d) points left
  17. 17.🦾 A servo moves from 150° to 50°. How many degrees does it turn?
  18. 18.🦾 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 straight up
  19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  20. 20.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
  21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  22. 22.🦾 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 left (d) points up and right
  23. 23.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  24. 24.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  25. 25.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  26. 26.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  27. 27.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  29. 29.🦾 A servo moves from 110° to 10°. How many degrees does it turn?
  30. 30.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  31. 31.🦾 A servo moves from 80° to 110°. How many degrees does it turn?
  32. 32.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
  33. 33.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle + 50
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  34. 34.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle − 50
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 50
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
  38. 38.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  39. 39.🦾 A servo moves from 170° to 180°. How many degrees does it turn?
  40. 40.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor

Answer key

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

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