Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 587 · 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.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
3. 3.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
6. 6.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
9. 9.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
10. 10.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
11. 11.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
12. 12.🦾 A servo moves from 170° to 20°. How many degrees does it turn?
13. 13.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
14. 14.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
16. 16.🦾 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 straight up (c) points up and right (d) points left
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
18. 18.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
19. 19.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo moves from 120° to 70°. How many degrees does it turn?
21. 21.🦾 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 right (c) points up and right (d) points left
22. 22.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
23. 23.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
26. 26.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a DC motor (d) a buzzer
27. 27.🦾 A servo moves from 170° to 80°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
30. 30.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
31. 31.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle − 30
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle + 10
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.🦾 A servo moves from 90° to 70°. How many degrees does it turn?
36. 36.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
38. 38.🦾 A servo moves from 70° to 0°. How many degrees does it turn?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
40. 40.🦾 A servo moves from 80° to 160°. How many degrees does it turn?

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