Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 413 · 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 90°?
2. 2.🦾 A servo moves from 120° to 130°. How many degrees does it turn?
3. 3.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
4. 4.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
5. 5.🦾 A servo program runs:
   angle = 10
   angle = angle + 50
   angle = angle − 20
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
8. 8.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
9. 9.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
10. 10.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
11. 11.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
13. 13.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
14. 14.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
15. 15.🦾 A servo moves from 60° to 160°. How many degrees does it turn?
16. 16.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
21. 21.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
24. 24.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
25. 25.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
26. 26.🦾 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 left (c) points straight up (d) points right
27. 27.🦾 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 up and right (c) points straight up (d) points up and left
28. 28.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
31. 31.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
32. 32.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
33. 33.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
34. 34.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
35. 35.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo moves from 70° to 110°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 60
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
39. 39.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle + 20
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?

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