Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 824 · 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 servo motor. (a) False (b) True
2. 2.🦾 A servo moves from 110° to 50°. How many degrees does it turn?
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
4. 4.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
5. 5.🦾 A servo program runs:
   angle = 0
   angle = angle + 20
   angle = angle − 10
   angle = angle + 50
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
7. 7.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
10. 10.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
11. 11.🦾 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 straight up (b) points left (c) points up and right (d) points up and left
12. 12.🦾 A servo moves from 60° to 70°. How many degrees does it turn?
13. 13.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 30
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 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 up and left (b) points left (c) points right (d) points up and right
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
17. 17.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 10
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
20. 20.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
24. 24.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
25. 25.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
29. 29.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
30. 30.🦾 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 up and right (b) points left (c) points right (d) points straight up
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
32. 32.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
34. 34.🦾 A servo moves from 0° to 160°. How many degrees does it turn?
35. 35.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
36. 36.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 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 left (b) points right (c) points up and right (d) points straight up
39. 39.🦾 A servo moves from 130° to 40°. How many degrees does it turn?
40. 40.🦾 A servo moves from 20° to 160°. How many degrees does it turn?

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