Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 988 · 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.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
4. 4.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
6. 6.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
7. 7.🦾 A servo moves from 10° to 80°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
9. 9.🦾 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 left (c) points up and left (d) points straight up
10. 10.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 50
    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 light sensor (b) a buzzer (c) a DC motor (d) a servo motor
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.🦾 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 left (c) points straight up (d) points right
16. 16.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
18. 18.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
19. 19.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
20. 20.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
21. 21.🦾 A servo moves from 40° to 120°. How many degrees does it turn?
22. 22.🦾 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 straight up (b) points left (c) points up and right (d) points up and left
23. 23.🦾 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 straight up (c) points up and left (d) points left
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: “turns to an exact angle” is true of a servo motor. (a) False (b) True
26. 26.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
27. 27.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
28. 28.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
29. 29.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
30. 30.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
31. 31.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
32. 32.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
33. 33.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
34. 34.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
35. 35.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo moves from 180° to 90°. How many degrees does it turn?
37. 37.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
38. 38.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 70° to 20°. How many degrees does it turn?

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