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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 518 · 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 has a signal wire? (a) a servo motor (b) a DC motor
  2. 2.🦾 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 up and left (b) points right (c) points straight up (d) points left
  3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
  4. 4.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
  5. 5.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  6. 6.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  8. 8.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
  9. 9.🦾 A servo moves from 0° to 100°. How many degrees does it turn?
  10. 10.🦾 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 right (b) points up and left (c) points left (d) points up and right
  11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
  12. 12.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
  13. 13.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
  14. 14.True or false: “has just two wires” 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 program runs:
    angle = 80
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  17. 17.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  18. 18.🦾 A servo program runs:
    angle = 90
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  19. 19.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  20. 20.⚙️ 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
  21. 21.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
  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 up and left (b) points straight up (c) points up and right (d) points left
  23. 23.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 10
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  24. 24.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
  25. 25.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  27. 27.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 50
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  30. 30.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  31. 31.🦾 A servo moves from 110° to 50°. How many degrees does it turn?
  32. 32.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  33. 33.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  35. 35.🦾 A servo program runs:
    angle = 60
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  39. 39.🦾 A servo program runs:
    angle = 140
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle + 10
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. a servo motor
  2. points straight up
  3. a servo motor
  4. points up and left
  5. 50
  6. True
  7. a servo motor
  8. swap its two wires
  9. 100
  10. points right
  11. a DC motor
  12. movement
  13. 180°
  14. False
  15. a DC motor
  16. 40
  17. True
  18. 140
  19. a servo motor
  20. a DC motor
  21. 80
  22. points up and right
  23. 60
  24. False
  25. True
  26. 250
  27. False
  28. 100
  29. 300
  30. False
  31. 60
  32. True
  33. a DC motor
  34. False
  35. 50
  36. 100
  37. a DC motor
  38. a servo motor
  39. 120
  40. 160

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