Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 516 · 40 questions

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.

1. 1.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
4. 4.🦾 A servo program runs:
   angle = 180
   angle = angle − 40
   angle = angle − 30
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 A servo moves from 40° to 130°. How many degrees does it turn?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
8. 8.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
9. 9.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
10. 10.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 20
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
12. 12.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo moves from 40° to 170°. How many degrees does it turn?
14. 14.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
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 up and left (b) points straight up (c) points right (d) points up and right
16. 16.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
17. 17.🦾 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 left (b) points right (c) points up and left (d) points straight up
18. 18.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
20. 20.🦾 A servo moves from 120° to 160°. How many degrees does it turn?
21. 21.🦾 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 up and right (c) points up and left (d) points left
22. 22.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
23. 23.🦾 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 left (c) points up and right (d) points up and left
24. 24.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.🦾 A servo moves from 70° to 160°. How many degrees does it turn?
29. 29.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
30. 30.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo moves from 140° to 160°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 30
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a DC motor (d) a buzzer
34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 40
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
37. 37.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle − 20
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor

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