Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 548 · 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 180°. Where does the arm point? (a) points left (b) points up and right (c) points right (d) points up and left
2. 2.🦾 A servo program runs:
   angle = 50
   angle = angle + 60
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
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 straight up (b) points up and left (c) points right (d) points up and right
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
5. 5.🦾 A servo program runs:
   angle = 10
   angle = angle + 50
   angle = angle − 20
   angle = angle − 20
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
7. 7.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
9. 9.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
13. 13.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
14. 14.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
15. 15.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
17. 17.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
18. 18.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
19. 19.🦾 A servo moves from 150° to 100°. How many degrees does it turn?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
22. 22.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
24. 24.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 40
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
28. 28.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
29. 29.🦾 A servo moves from 20° to 40°. How many degrees does it turn?
30. 30.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle − 10
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
34. 34.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 10° to 120°. How many degrees does it turn?
38. 38.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
40. 40.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?

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