Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 354 · 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 moves from 170° to 160°. How many degrees does it turn?
2. 2.🦾 A servo program runs:
   angle = 30
   angle = angle + 40
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
4. 4.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
6. 6.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
7. 7.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
8. 8.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
9. 9.🦾 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 right (b) points right (c) points up and left (d) points straight up
10. 10.🦾 A servo moves from 100° to 130°. How many degrees does it turn?
11. 11.🦾 A servo moves from 20° to 120°. How many degrees does it turn?
12. 12.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
13. 13.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo moves from 80° to 0°. 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
19. 19.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
21. 21.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
23. 23.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
24. 24.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
25. 25.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
26. 26.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
27. 27.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 50
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 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 left (b) points up and right (c) points up and left (d) points right
31. 31.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo moves from 180° to 0°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 20
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 10° to 60°. How many degrees does it turn?
39. 39.🦾 A servo moves from 60° to 10°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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