Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 588 · 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 program runs:
   angle = 110
   angle = angle − 50
   angle = angle + 50
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
3. 3.🦾 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 right (c) points up and left (d) points up and right
4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
5. 5.🦾 A servo program runs:
   angle = 40
   angle = angle − 10
   angle = angle − 20
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
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 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 right (b) points up and left (c) points straight up (d) points right
14. 14.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
15. 15.🦾 A servo moves from 40° to 70°. How many degrees does it turn?
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
17. 17.⚙️ 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
18. 18.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
19. 19.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
20. 20.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
22. 22.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
24. 24.🦾 A servo moves from 0° to 180°. How many degrees does it turn?
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
27. 27.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
29. 29.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
31. 31.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
32. 32.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
33. 33.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
34. 34.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
35. 35.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
36. 36.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
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 up and left (b) points straight up (c) points up and right (d) points right
39. 39.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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