Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 599 · 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 = 90
   angle = angle + 40
   angle = angle − 50
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
2. 2.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
3. 3.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
4. 4.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
5. 5.🦾 A servo program runs:
   angle = 100
   angle = angle + 10
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
7. 7.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
11. 11.🦾 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
12. 12.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
13. 13.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
14. 14.🦾 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 left (b) points straight up (c) points up and left (d) points up and right
15. 15.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
17. 17.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo moves from 180° to 170°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
21. 21.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
22. 22.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
23. 23.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
26. 26.🦾 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 left (c) points right (d) points straight up
27. 27.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle + 10
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
30. 30.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 50
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ 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
32. 32.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle − 20
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
35. 35.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo moves from 40° to 170°. How many degrees does it turn?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
39. 39.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 120
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?

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