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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 407 · 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.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  3. 3.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
  4. 4.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  5. 5.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
  6. 6.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
  7. 7.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
  8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
  9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
  10. 10.🦾 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 up and right (c) points right (d) points up and left
  11. 11.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
  12. 12.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  13. 13.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  14. 14.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  15. 15.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  17. 17.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  21. 21.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  22. 22.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
  23. 23.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  24. 24.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  26. 26.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  27. 27.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  28. 28.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  30. 30.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
  31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  32. 32.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
  34. 34.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  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 program runs:
    angle = 110
    angle = angle − 10
    angle = angle + 20
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  37. 37.🦾 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 left (d) points straight up
  38. 38.🦾 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 left (c) points up and right (d) points straight up
  39. 39.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
  40. 40.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. False
  2. True
  3. True
  4. 120
  5. True
  6. 180°
  7. movement
  8. a servo motor
  9. a DC motor
  10. points up and left
  11. swap its two wires
  12. a servo motor
  13. a DC motor
  14. True
  15. True
  16. 50
  17. True
  18. 100
  19. a DC motor
  20. a servo motor
  21. False
  22. True
  23. False
  24. 120
  25. 250
  26. True
  27. a servo motor
  28. True
  29. a DC motor
  30. 20
  31. a servo motor
  32. False
  33. 150
  34. False
  35. a servo motor
  36. 120
  37. points straight up
  38. points up and right
  39. False
  40. 50

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