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Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 774 · 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 program runs:
    angle = 130
    angle = angle − 50
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  2. 2.🦾 A servo moves from 160° to 90°. How many degrees does it turn?
  3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
  4. 4.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
  6. 6.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
  8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
  9. 9.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
  10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
  11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
  12. 12.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  13. 13.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
  14. 14.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
  15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
  16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  17. 17.🦾 A servo moves from 70° to 60°. How many degrees does it turn?
  18. 18.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
  19. 19.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 30
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
  20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  21. 21.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  22. 22.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
  23. 23.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  24. 24.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  25. 25.🦾 A servo program runs:
    angle = 120
    angle = angle + 30
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  26. 26.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
  27. 27.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  28. 28.🦾 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 left (c) points up and right (d) points right
  29. 29.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
  30. 30.🦾 A servo moves from 10° to 110°. How many degrees does it turn?
  31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  32. 32.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 10
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  33. 33.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  34. 34.🦾 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 right (b) points left (c) points up and left (d) points right
  35. 35.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
  36. 36.🦾 A servo moves from 110° to 120°. How many degrees does it turn?
  37. 37.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
  38. 38.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
  39. 39.🦾 A servo program runs:
    angle = 170
    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 program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. 40
  2. 70
  3. a servo motor
  4. 110
  5. a servo motor
  6. 50
  7. a DC motor
  8. a servo motor
  9. movement
  10. a DC motor
  11. a servo motor
  12. False
  13. True
  14. 160
  15. a DC motor
  16. a DC motor
  17. 10
  18. 20
  19. 70
  20. 50
  21. a DC motor
  22. 80
  23. 130
  24. 70
  25. 160
  26. 10
  27. False
  28. points up and left
  29. 180°
  30. 100
  31. a servo motor
  32. 170
  33. 90
  34. points left
  35. True
  36. 10
  37. swap its two wires
  38. False
  39. 140
  40. 90

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