Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 180 · 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) 18° (b) 1800° (c) 180° (d) 10°
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
3. 3.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
5. 5.🦾 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 right (b) points straight up (c) points up and left (d) points left
6. 6.⚙️ 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
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
10. 10.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
12. 12.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
13. 13.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
16. 16.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
17. 17.🦾 A servo moves from 70° to 100°. How many degrees does it turn?
18. 18.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
19. 19.🦾 A servo moves from 10° to 150°. How many degrees does it turn?
20. 20.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
21. 21.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.🦾 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 up and right (c) points straight up (d) points left
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
30. 30.🦾 A servo moves from 140° to 0°. How many degrees does it turn?
31. 31.🦾 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 right (b) points left (c) points straight up (d) points right
32. 32.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
34. 34.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 30
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
36. 36.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
37. 37.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
38. 38.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo program runs:
    angle = 140
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False

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