Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 280 · 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.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo moves from 0° to 20°. How many degrees does it turn?
3. 3.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
5. 5.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
7. 7.🦾 A servo program runs:
   angle = 90
   angle = angle − 20
   angle = angle − 20
   angle = angle + 20
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo moves from 150° to 60°. How many degrees does it turn?
12. 12.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 20
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
15. 15.🦾 A servo moves from 50° to 100°. How many degrees does it turn?
16. 16.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
17. 17.🦾 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 left (b) points up and right (c) points straight up (d) points right
18. 18.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
22. 22.🦾 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 right (d) points straight up
23. 23.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
25. 25.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 80
    angle = angle + 20
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
28. 28.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
29. 29.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
32. 32.🦾 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 right (b) points up and left (c) points left (d) points right
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo moves from 40° to 150°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 40
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 90° to 110°. How many degrees does it turn?
39. 39.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo moves from 30° to 160°. How many degrees does it turn?

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