Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 369 · 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 common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
3. 3.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
4. 4.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
6. 6.🦾 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 left (b) points right (c) points left (d) points up and right
7. 7.🦾 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 right (b) points up and right (c) points left (d) points straight up
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
11. 11.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
15. 15.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
17. 17.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
19. 19.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle − 10
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo moves from 40° to 50°. How many degrees does it turn?
22. 22.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
23. 23.⚙️ 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
24. 24.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
26. 26.🦾 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 right (c) points up and left (d) points left
27. 27.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
28. 28.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
29. 29.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
31. 31.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
32. 32.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 70° to 170°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 20
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
40. 40.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water

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