Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 226 · 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 reverses if wires swap? (a) a DC motor (b) a servo motor
2. 2.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
3. 3.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
4. 4.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
6. 6.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
7. 7.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
8. 8.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
9. 9.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
10. 10.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
13. 13.🦾 A servo moves from 30° to 60°. How many degrees does it turn?
14. 14.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle + 10
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
17. 17.🦾 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 left (b) points up and right (c) points straight up (d) points up and left
18. 18.🦾 A servo moves from 100° to 170°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo program runs:
    angle = 130
    angle = angle − 40
    angle = angle − 40
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 10
    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 program runs:
    angle = 120
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 30
    angle = angle + 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle + 10
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
27. 27.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
31. 31.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo moves from 140° to 10°. How many degrees does it turn?
33. 33.🦾 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 straight up
34. 34.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
35. 35.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 60
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
39. 39.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
40. 40.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor

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