Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 35 · 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 DC motor (b) a servo motor
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
4. 4.🦾 A servo program runs:
   angle = 0
   angle = angle + 10
   angle = angle + 10
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
7. 7.🦾 A servo program runs:
   angle = 170
   angle = angle − 20
   angle = angle − 40
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
12. 12.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
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: “has a signal wire” is true of a servo motor. (a) True (b) False
15. 15.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 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 right (c) points straight up (d) points up and right
17. 17.🦾 A servo moves from 180° to 90°. How many degrees does it turn?
18. 18.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
19. 19.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
21. 21.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 40
    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 30°?
23. 23.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
26. 26.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo moves from 50° to 170°. How many degrees does it turn?
28. 28.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
31. 31.🦾 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 straight up (c) points right (d) points up and left
32. 32.🦾 A servo moves from 160° to 20°. How many degrees does it turn?
33. 33.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
34. 34.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 150° to 10°. How many degrees does it turn?
36. 36.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
37. 37.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 40
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 30
    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