← DC motors and servo motors lesson New set →

Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 63 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
  2. 2.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
  3. 3.🦾 A servo moves from 90° to 120°. How many degrees does it turn?
  4. 4.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
  5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
  6. 6.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
  7. 7.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
  8. 8.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
  9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
  10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
  11. 11.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle + 60
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
  12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
  13. 13.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
  14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
  15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
  16. 16.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
  17. 17.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
  18. 18.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
  19. 19.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
  20. 20.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
  21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
  22. 22.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  23. 23.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
  24. 24.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle + 30
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
  25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
  26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
  27. 27.🦾 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 up and right (c) points straight up (d) points right
  28. 28.🦾 A servo moves from 120° to 140°. How many degrees does it turn?
  29. 29.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle + 30
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
  30. 30.🦾 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 right (b) points up and left (c) points left (d) points up and right
  31. 31.🦾 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 right (c) points left (d) points up and left
  32. 32.🦾 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 right (b) points straight up (c) points up and right (d) points up and left
  33. 33.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
  34. 34.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
  35. 35.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
  36. 36.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
  37. 37.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
  38. 38.🦾 A servo moves from 70° to 40°. How many degrees does it turn?
  39. 39.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
  40. 40.True or false: “has just two wires” is true of a servo motor. (a) True (b) False

Answer key

  1. 100
  2. movement
  3. 30
  4. False
  5. 300
  6. True
  7. 70
  8. True
  9. a DC motor
  10. a DC motor
  11. 180
  12. a servo motor
  13. swap its two wires
  14. a DC motor
  15. a servo motor
  16. False
  17. 10
  18. True
  19. 20
  20. True
  21. a servo motor
  22. 40
  23. False
  24. 150
  25. a DC motor
  26. a servo motor
  27. points straight up
  28. 20
  29. 90
  30. points up and left
  31. points right
  32. points up and right
  33. True
  34. False
  35. False
  36. 90
  37. False
  38. 30
  39. 10
  40. False

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