Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 847 · 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 common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
2. 2.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
3. 3.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
5. 5.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
6. 6.🦾 A servo program runs:
   angle = 60
   angle = angle − 30
   angle = angle − 10
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
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 right (d) points up and right
9. 9.🦾 A servo moves from 50° to 70°. How many degrees does it turn?
10. 10.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
11. 11.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo moves from 10° to 140°. How many degrees does it turn?
13. 13.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
15. 15.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
19. 19.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
20. 20.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
21. 21.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
22. 22.🦾 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 left (c) points up and left (d) points up and right
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 left (b) points straight up (c) points right (d) points up and right
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
25. 25.🦾 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 right (c) points up and right (d) points up and left
26. 26.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
27. 27.🦾 A servo moves from 100° to 40°. How many degrees does it turn?
28. 28.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
29. 29.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
30. 30.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
31. 31.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 10
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
34. 34.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle + 40
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 50
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
38. 38.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
40. 40.🦾 A servo moves from 130° to 70°. How many degrees does it turn?

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