Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 827 · 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 program runs:
   angle = 150
   angle = angle − 60
   angle = angle + 20
   angle = angle + 50
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 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 left (c) points up and left (d) points up and right
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo program runs:
   angle = 20
   angle = angle + 20
   angle = angle − 20
   angle = angle + 40
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 A servo moves from 20° to 160°. How many degrees does it turn?
6. 6.🦾 A servo program runs:
   angle = 10
   angle = angle − 10
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.🦾 A servo program runs:
   angle = 150
   angle = angle − 30
   angle = angle + 10
   angle = angle + 10
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ 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
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
12. 12.🦾 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 right (c) points up and right (d) points left
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
16. 16.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
18. 18.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
19. 19.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
20. 20.🦾 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 up and left (b) points left (c) points straight up (d) points right
21. 21.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 60
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
24. 24.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
26. 26.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
27. 27.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
28. 28.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
29. 29.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
32. 32.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
34. 34.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
35. 35.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
36. 36.🦾 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 straight up (c) points up and left (d) points right
37. 37.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
38. 38.🦾 A servo moves from 50° to 180°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 80° to 90°. How many degrees does it turn?

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