Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 289 · 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 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 left (c) points right (d) points up and right
2. 2.🦾 A servo moves from 50° to 70°. How many degrees does it turn?
3. 3.🦾 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 left (b) points right (c) points up and right (d) points straight up
4. 4.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
6. 6.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
10. 10.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle + 40
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
14. 14.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
16. 16.🦾 A servo moves from 40° to 120°. How many degrees does it turn?
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
19. 19.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo moves from 130° to 150°. How many degrees does it turn?
24. 24.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo moves from 10° to 160°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 60
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo moves from 160° to 100°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
37. 37.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo moves from 90° to 70°. How many degrees does it turn?
39. 39.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
40. 40.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False

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