Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 375 · 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: “spins round and round” is true of a servo motor. (a) True (b) False
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo moves from 100° to 170°. How many degrees does it turn?
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
6. 6.🦾 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 straight up (b) points right (c) points up and right (d) points up and left
7. 7.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
8. 8.🦾 A servo program runs:
   angle = 130
   angle = angle − 60
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 A servo moves from 160° to 100°. How many degrees does it turn?
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
11. 11.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
12. 12.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
13. 13.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
14. 14.🦾 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 right (c) points up and left (d) points left
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
16. 16.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
18. 18.🦾 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 straight up (c) points up and right (d) points left
19. 19.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
21. 21.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
23. 23.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
24. 24.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
25. 25.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
26. 26.⚙️ 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
27. 27.🦾 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 up and right (c) points straight up (d) points right
28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 60
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
32. 32.🦾 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 left (b) points up and right (c) points left (d) points straight up
33. 33.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
36. 36.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 50° to 170°. How many degrees does it turn?
38. 38.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor

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