Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 157 · 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 motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.🦾 A servo moves from 150° to 0°. How many degrees does it turn?
5. 5.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
6. 6.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
7. 7.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
8. 8.🦾 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 left (c) points left (d) points right
9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
14. 14.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
15. 15.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
16. 16.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
19. 19.🦾 A servo moves from 50° to 150°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
21. 21.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
22. 22.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.🦾 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 up and right (d) points right
25. 25.🦾 A servo program runs:
    angle = 120
    angle = angle + 50
    angle = angle − 50
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
27. 27.🦾 A servo program runs:
    angle = 60
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 10
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
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 straight up (d) points up and right
36. 36.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle − 10
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 160° to 80°. How many degrees does it turn?
38. 38.🦾 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 left (b) points straight up (c) points right (d) points up and right
39. 39.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?

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