Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 889 · 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 0°. Where does the arm point? (a) points left (b) points up and right (c) points right (d) points straight up
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo program runs:
   angle = 150
   angle = angle − 50
   angle = angle − 60
   angle = angle + 60
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
5. 5.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
6. 6.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
7. 7.🦾 A servo program runs:
   angle = 150
   angle = angle − 30
   angle = angle + 30
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
9. 9.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
10. 10.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
11. 11.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
12. 12.🦾 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 left (b) points straight up (c) points up and left (d) points right
13. 13.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
16. 16.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
18. 18.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
19. 19.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
20. 20.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
22. 22.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.🦾 A servo moves from 170° to 20°. How many degrees does it turn?
26. 26.🦾 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 right (b) points left (c) points up and right (d) points up and left
27. 27.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
29. 29.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
30. 30.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo moves from 140° to 90°. How many degrees does it turn?
32. 32.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
35. 35.🦾 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 left (b) points up and right (c) points right (d) points straight up
36. 36.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
37. 37.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 40
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “spins round and round” is true of a servo motor. (a) True (b) False

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