Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 861 · 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 common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
3. 3.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
4. 4.🦾 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 left (c) points straight up (d) points right
5. 5.🦾 A servo moves from 120° to 60°. How many degrees does it turn?
6. 6.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
7. 7.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo program runs:
   angle = 20
   angle = angle − 10
   angle = angle + 20
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo moves from 30° to 160°. How many degrees does it turn?
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
14. 14.🦾 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 up and right (c) points left (d) points right
15. 15.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
17. 17.⚙️ 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
18. 18.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
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 program runs:
    angle = 60
    angle = angle + 40
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
24. 24.🦾 A servo moves from 150° to 120°. How many degrees does it turn?
25. 25.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
26. 26.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
29. 29.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
30. 30.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo program runs:
    angle = 120
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
33. 33.🦾 A servo moves from 150° to 170°. How many degrees does it turn?
34. 34.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 180° to 170°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

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