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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 50 · 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.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
  2. 2.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  3. 3.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  6. 6.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  7. 7.🦾 A servo moves from 10° to 20°. How many degrees does it turn?
  8. 8.🦾 A servo moves from 100° to 70°. How many degrees does it turn?
  9. 9.🦾 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 up and left
  10. 10.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
  11. 11.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
  12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
  13. 13.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  14. 14.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  15. 15.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
  17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  18. 18.🦾 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 left (b) points up and right (c) points straight up (d) points right
  19. 19.🦾 A servo moves from 180° to 0°. How many degrees does it turn?
  20. 20.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  21. 21.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
  22. 22.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  24. 24.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  25. 25.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
  26. 26.🦾 A servo moves from 10° to 0°. How many degrees does it turn?
  27. 27.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  29. 29.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 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 up and left
  31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  32. 32.🦾 A servo moves from 90° to 80°. How many degrees does it turn?
  33. 33.🦾 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 right (c) points left (d) points up and left
  34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  35. 35.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
  36. 36.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  37. 37.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle − 40
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  38. 38.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
  39. 39.🦾 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 up and left (b) points right (c) points left (d) points straight up
  40. 40.True or false: “spins round and round” is true of a servo motor. (a) False (b) True

Answer key

  1. False
  2. 120
  3. True
  4. a servo motor
  5. 250
  6. 30
  7. 10
  8. 30
  9. points straight up
  10. swap its two wires
  11. a DC motor
  12. a DC motor
  13. True
  14. True
  15. 90
  16. a servo motor
  17. a DC motor
  18. points right
  19. 180
  20. True
  21. movement
  22. True
  23. a servo motor
  24. False
  25. 180°
  26. 10
  27. True
  28. 200
  29. 50
  30. points left
  31. a servo motor
  32. 10
  33. points up and right
  34. 100
  35. 60
  36. a servo motor
  37. 120
  38. True
  39. points up and left
  40. False

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