Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 40 · 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 up and left (b) points up and right (c) points left (d) points right
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
3. 3.🦾 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 left (c) points straight up (d) points up and left
4. 4.🦾 A servo program runs:
   angle = 70
   angle = angle + 20
   angle = angle − 40
   angle = angle + 60
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
6. 6.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
8. 8.🦾 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
9. 9.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo moves from 20° to 140°. How many degrees does it turn?
14. 14.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
17. 17.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
19. 19.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
22. 22.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
23. 23.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
24. 24.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo moves from 60° to 50°. How many degrees does it turn?
26. 26.🦾 A servo moves from 110° to 170°. How many degrees does it turn?
27. 27.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
28. 28.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
29. 29.🦾 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 straight up (b) points up and right (c) points right (d) points left
30. 30.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
31. 31.🦾 A servo moves from 140° to 0°. How many degrees does it turn?
32. 32.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
34. 34.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
35. 35.🦾 A servo moves from 130° to 30°. How many degrees does it turn?
36. 36.🦾 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 up and right (b) points up and left (c) points right (d) points left
37. 37.🦾 A servo moves from 100° to 110°. How many degrees does it turn?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
39. 39.🦾 A servo moves from 100° to 80°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 50
    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