Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 853 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
2. 2.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
3. 3.🦾 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 right (c) points up and left (d) points right
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
5. 5.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
6. 6.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
7. 7.🦾 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 straight up (b) points up and left (c) points up and right (d) points right
8. 8.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
9. 9.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
10. 10.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
11. 11.🦾 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 up and right (c) points up and left (d) points right
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
13. 13.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo moves from 90° to 100°. How many degrees does it turn?
16. 16.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 20
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
19. 19.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
20. 20.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
24. 24.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
25. 25.🦾 A servo moves from 40° to 110°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 straight up (b) points up and left (c) points left (d) points right
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
30. 30.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
31. 31.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo program runs:
    angle = 140
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
35. 35.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle + 60
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
38. 38.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?

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