Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 665 · 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.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
2. 2.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
4. 4.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
6. 6.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
7. 7.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
10. 10.🦾 A servo moves from 110° to 40°. How many degrees does it turn?
11. 11.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
12. 12.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
13. 13.🦾 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 straight up (b) points left (c) points up and right (d) points up and left
14. 14.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
15. 15.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
16. 16.🦾 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 straight up (b) points right (c) points up and right (d) points left
17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 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 left (b) points right (c) points straight up (d) points up and left
22. 22.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
23. 23.🦾 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 up and left (c) points straight up (d) points right
24. 24.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo program runs:
    angle = 60
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 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 right (c) points up and left (d) points straight up
27. 27.🦾 A servo moves from 100° to 170°. How many degrees does it turn?
28. 28.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
29. 29.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 60
    angle = angle + 50
    angle = angle + 60
    angle = angle − 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 180° to 50°. How many degrees does it turn?
33. 33.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
34. 34.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 60
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 20
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 70° to 40°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor

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