Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 431 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
2. 2.🦾 A servo program runs:
   angle = 130
   angle = angle + 30
   angle = angle − 50
   angle = angle − 50
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
4. 4.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
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 right (c) points up and right (d) points straight up
6. 6.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo program runs:
   angle = 180
   angle = angle − 50
   angle = angle − 50
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
9. 9.🦾 A servo moves from 100° to 90°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
12. 12.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
14. 14.🦾 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 up and left (d) points straight up
15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
16. 16.🦾 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 up and right (c) points right (d) points left
17. 17.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
18. 18.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
19. 19.⚙️ 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
20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo program runs:
    angle = 100
    angle = angle + 60
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle + 50
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
26. 26.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
27. 27.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle − 10
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
30. 30.🦾 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 straight up (c) points left (d) points up and right
31. 31.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
32. 32.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 60
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
38. 38.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor

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