Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 49 · 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 spins faster with more V? (a) a servo motor (b) a DC motor
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
3. 3.🦾 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 up and left (b) points straight up (c) points right (d) points up and right
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
5. 5.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
6. 6.🦾 A servo program runs:
   angle = 20
   angle = angle + 40
   angle = angle − 10
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 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 right (c) points straight up (d) points up and left
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo moves from 10° to 160°. How many degrees does it turn?
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
15. 15.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
17. 17.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
18. 18.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
19. 19.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 10
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle − 60
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
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 turns to an exact angle? (a) a DC motor (b) a servo motor
25. 25.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
26. 26.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
27. 27.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
29. 29.🦾 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 up and left (c) points up and right (d) points left
30. 30.🦾 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 right (b) points up and right (c) points straight up (d) points left
31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
32. 32.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
33. 33.🦾 A servo moves from 50° to 10°. How many degrees does it turn?
34. 34.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 20
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
37. 37.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo moves from 170° to 120°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?

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