Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 365 · 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.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
2. 2.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
3. 3.🦾 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 up and right (c) points right (d) points up and left
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
5. 5.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo moves from 0° to 170°. How many degrees does it turn?
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
9. 9.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
11. 11.🦾 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 left (b) points up and right (c) points right (d) points up and left
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
13. 13.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
14. 14.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo moves from 70° to 20°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 60
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 70
    angle = angle + 60
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo moves from 140° to 70°. How many degrees does it turn?
21. 21.🦾 A servo moves from 160° to 80°. 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 45°. Where does the arm point? (a) points up and right (b) points up and left (c) points right (d) points straight up
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
26. 26.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
28. 28.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
29. 29.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 60
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
35. 35.🦾 A servo moves from 0° to 130°. How many degrees does it turn?
36. 36.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
37. 37.🦾 A servo moves from 10° to 110°. How many degrees does it turn?
38. 38.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
39. 39.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
40. 40.🦾 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 right (b) points up and left (c) points right (d) points left

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