Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 680 · 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 round and round? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
3. 3.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
4. 4.⚙️ 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
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
8. 8.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
9. 9.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
11. 11.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
13. 13.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
14. 14.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
15. 15.🦾 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 left (c) points right (d) points straight up
16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
17. 17.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle + 20
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo moves from 50° to 130°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
21. 21.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 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 up and right (d) points straight up
23. 23.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
27. 27.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
29. 29.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle − 30
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
32. 32.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 120
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
35. 35.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle − 10
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle − 10
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 80° to 160°. How many degrees does it turn?
38. 38.🦾 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 left (b) points straight up (c) points right (d) points up and right
39. 39.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
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