Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 612 · 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 45°. Where does the arm point? (a) points straight up (b) points right (c) points left (d) points up and right
2. 2.🦾 A servo moves from 120° to 180°. How many degrees does it turn?
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
5. 5.🦾 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 left (d) points straight up
6. 6.🦾 A servo program runs:
   angle = 60
   angle = angle − 50
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
9. 9.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
10. 10.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
11. 11.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
12. 12.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (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 90°. Where does the arm point? (a) points up and left (b) points up and right (c) points right (d) points straight up
17. 17.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
20. 20.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
24. 24.⚙️ 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
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
28. 28.🦾 A servo moves from 0° to 170°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
31. 31.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
32. 32.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo moves from 170° to 40°. How many degrees does it turn?
34. 34.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
35. 35.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
36. 36.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
37. 37.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 10
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 130
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor

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