Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 92 · 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 has just two wires? (a) a DC motor (b) a servo motor
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo moves from 60° to 140°. How many degrees does it turn?
6. 6.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
8. 8.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
9. 9.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo program runs:
    angle = 90
    angle = angle + 30
    angle = angle − 30
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
12. 12.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
13. 13.⚙️ 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
14. 14.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
20. 20.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
21. 21.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
22. 22.🦾 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 left (c) points up and right (d) points straight up
23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 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 right (c) points up and left (d) points left
26. 26.🦾 A servo program runs:
    angle = 70
    angle = angle − 30
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 up and left (d) points straight up
28. 28.🦾 A servo program runs:
    angle = 80
    angle = angle + 30
    angle = angle + 20
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
30. 30.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo moves from 50° to 10°. How many degrees does it turn?
32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
33. 33.🦾 A servo program runs:
    angle = 60
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
38. 38.⚙️ 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
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
40. 40.🦾 A servo moves from 40° to 120°. How many degrees does it turn?

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