Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 750 · 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 90°. Where does the arm point? (a) points straight up (b) points up and right (c) points up and left (d) points right
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
3. 3.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
6. 6.🦾 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 left (c) points straight up (d) points up and right
7. 7.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
8. 8.🦾 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 straight up (c) points up and right (d) points right
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
11. 11.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo moves from 100° to 40°. How many degrees does it turn?
14. 14.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
15. 15.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 40
    angle = angle − 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
17. 17.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
19. 19.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle + 50
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
25. 25.True or false: “has just two wires” is true of a servo 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 left (b) points straight up (c) points up and right (d) points right
27. 27.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
28. 28.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
29. 29.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
32. 32.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
33. 33.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
34. 34.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
37. 37.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
38. 38.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 30° to 150°. How many degrees does it turn?

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