Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 182 · 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 program runs:
   angle = 10
   angle = angle + 20
   angle = angle − 10
   angle = angle + 60
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
3. 3.🦾 A servo program runs:
   angle = 160
   angle = angle + 10
   angle = angle − 40
   angle = angle − 10
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
6. 6.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
9. 9.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
11. 11.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
13. 13.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 40
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
15. 15.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
17. 17.🦾 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 left (c) points right (d) points up and right
18. 18.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
19. 19.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
22. 22.🦾 A servo moves from 100° to 10°. How many degrees does it turn?
23. 23.🦾 A servo moves from 90° to 180°. How many degrees does it turn?
24. 24.🦾 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 right (b) points up and left (c) points straight up (d) points right
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
26. 26.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
27. 27.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
28. 28.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
30. 30.🦾 A servo moves from 70° to 130°. How many degrees does it turn?
31. 31.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
32. 32.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
33. 33.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
35. 35.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
38. 38.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
40. 40.🦾 A servo moves from 170° to 10°. How many degrees does it turn?

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