← DC motors and servo motors lesson New set →

Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 739 · 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 − 10
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  2. 2.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
  3. 3.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
  4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
  5. 5.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
  6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
  7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
  8. 8.🦾 A servo moves from 0° to 20°. How many degrees does it turn?
  9. 9.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
  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 straight up (b) points left (c) points up and right (d) points right
  11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
  12. 12.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
  13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  14. 14.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  15. 15.🦾 A servo moves from 150° to 170°. How many degrees does it turn?
  16. 16.🦾 A servo moves from 120° to 80°. How many degrees does it turn?
  17. 17.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
  18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
  19. 19.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle − 60
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  20. 20.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
  21. 21.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
  22. 22.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
  23. 23.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
  24. 24.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
  25. 25.🦾 A servo moves from 180° to 0°. How many degrees does it turn?
  26. 26.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
  27. 27.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
  28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 50
    angle = angle + 40
    angle = angle + 30
    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 60°?
  30. 30.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
  32. 32.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
  33. 33.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
  34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
  35. 35.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
  36. 36.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
  37. 37.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  38. 38.🦾 A servo program runs:
    angle = 120
    angle = angle + 50
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
  39. 39.🦾 A servo moves from 180° to 110°. How many degrees does it turn?
  40. 40.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle − 10
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?

Answer key

  1. 40
  2. True
  3. False
  4. 250
  5. 10
  6. a servo motor
  7. a servo motor
  8. 20
  9. a servo motor
  10. points right
  11. a servo motor
  12. True
  13. a DC motor
  14. 0
  15. 20
  16. 40
  17. 140
  18. a servo motor
  19. 0
  20. True
  21. False
  22. 180°
  23. 90
  24. False
  25. 180
  26. 0
  27. a DC motor
  28. 80
  29. 100
  30. 180
  31. a DC motor
  32. movement
  33. False
  34. 50
  35. True
  36. False
  37. 40
  38. 100
  39. 70
  40. 60

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids