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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 72 · 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 spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
  2. 2.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  4. 4.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
  7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  8. 8.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  9. 9.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
  10. 10.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  11. 11.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
  13. 13.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  14. 14.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  15. 15.🦾 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 straight up (c) points left (d) points up and right
  16. 16.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  17. 17.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  18. 18.🦾 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 right (b) points left (c) points up and left (d) points straight up
  19. 19.🦾 A servo moves from 50° to 150°. How many degrees does it turn?
  20. 20.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
  21. 21.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  22. 22.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
  23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  24. 24.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  25. 25.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
  26. 26.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
  27. 27.🦾 A servo moves from 120° to 80°. How many degrees does it turn?
  28. 28.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  29. 29.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
  30. 30.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
  31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  32. 32.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
  33. 33.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle − 20
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
  35. 35.🦾 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 right (d) points up and right
  36. 36.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  38. 38.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 60
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  40. 40.🦾 A servo moves from 80° to 140°. How many degrees does it turn?

Answer key

  1. a DC motor
  2. 30
  3. 300
  4. False
  5. False
  6. a servo motor
  7. a servo motor
  8. a DC motor
  9. False
  10. False
  11. True
  12. 200
  13. 50
  14. True
  15. points right
  16. 50
  17. 50
  18. points straight up
  19. 100
  20. True
  21. True
  22. False
  23. a servo motor
  24. True
  25. movement
  26. 180°
  27. 40
  28. 30
  29. swap its two wires
  30. 20
  31. 250
  32. False
  33. 130
  34. 10
  35. points up and right
  36. 80
  37. False
  38. True
  39. 170
  40. 60

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