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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 271 · 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 90°?
  2. 2.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 10
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  3. 3.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
  4. 4.🦾 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 left (b) points right (c) points up and right (d) points left
  5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  7. 7.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  8. 8.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  9. 9.🦾 A servo program runs:
    angle = 70
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  11. 11.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
  13. 13.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
  14. 14.⚙️ 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
  15. 15.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  16. 16.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  17. 17.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
  18. 18.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  19. 19.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  21. 21.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  24. 24.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 40
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  25. 25.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 10
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  26. 26.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  27. 27.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  28. 28.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  30. 30.🦾 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 left (b) points right (c) points up and right (d) points up and left
  31. 31.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
  32. 32.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  33. 33.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  34. 34.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
  35. 35.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
  36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  38. 38.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  39. 39.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 30
    angle = angle − 50
    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 90°. Where does the arm point? (a) points straight up (b) points up and right (c) points up and left (d) points right

Answer key

  1. 150
  2. 60
  3. 180°
  4. points left
  5. a DC motor
  6. 100
  7. False
  8. True
  9. 20
  10. a DC motor
  11. 100
  12. a servo motor
  13. movement
  14. swap its two wires
  15. a DC motor
  16. False
  17. 80
  18. True
  19. True
  20. a servo motor
  21. False
  22. a DC motor
  23. 50
  24. 50
  25. 130
  26. False
  27. a servo motor
  28. 100
  29. a servo motor
  30. points up and left
  31. a DC motor
  32. True
  33. True
  34. 150
  35. 10
  36. 100
  37. a DC motor
  38. a servo motor
  39. 40
  40. points straight up

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