Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 843 · 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 motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
2. 2.🦾 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 left (c) points straight up (d) points up and right
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
5. 5.🦾 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 straight up (c) points up and left (d) points up and right
6. 6.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
7. 7.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
8. 8.⚙️ 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
9. 9.🦾 A servo moves from 120° to 30°. How many degrees does it turn?
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: “turns to an exact angle” is true of a DC motor. (a) True (b) False
12. 12.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle + 50
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
14. 14.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
15. 15.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 50
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
22. 22.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
24. 24.🦾 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 right (b) points up and right (c) points straight up (d) points up and left
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
26. 26.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
28. 28.🦾 A servo moves from 170° to 150°. How many degrees does it turn?
29. 29.🦾 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 right (b) points left (c) points straight up (d) points up and left
30. 30.🦾 A servo moves from 20° to 50°. How many degrees does it turn?
31. 31.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle + 20
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
33. 33.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
34. 34.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
36. 36.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 20
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
39. 39.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
40. 40.🦾 A servo moves from 110° to 10°. How many degrees does it turn?

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