Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 940 · 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: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
2. 2.🦾 A servo moves from 10° to 170°. How many degrees does it turn?
3. 3.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
4. 4.🦾 A servo program runs:
   angle = 90
   angle = angle − 10
   angle = angle − 50
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
6. 6.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
7. 7.🦾 A servo moves from 0° to 120°. How many degrees does it turn?
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
10. 10.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
13. 13.🦾 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 straight up (b) points up and right (c) points up and left (d) points left
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
15. 15.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
16. 16.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo moves from 100° to 130°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
20. 20.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
22. 22.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle − 10
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
28. 28.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
29. 29.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 10
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
31. 31.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
33. 33.🦾 A servo moves from 30° to 140°. How many degrees does it turn?
34. 34.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 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 left (b) points left (c) points right (d) points straight up
36. 36.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?

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