Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 610 · 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 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 left (c) points right (d) points up and right
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
3. 3.🦾 A servo moves from 130° to 140°. How many degrees does it turn?
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
7. 7.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
8. 8.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
9. 9.🦾 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 up and right (b) points right (c) points straight up (d) points left
10. 10.🦾 A servo moves from 90° to 170°. How many degrees does it turn?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
12. 12.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
13. 13.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC 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.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
17. 17.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
19. 19.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 40
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
22. 22.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo moves from 140° to 90°. How many degrees does it turn?
25. 25.🦾 A servo program runs:
    angle = 60
    angle = angle + 20
    angle = angle + 30
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
27. 27.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle − 10
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo moves from 50° to 150°. How many degrees does it turn?
31. 31.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
34. 34.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
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 program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 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
39. 39.🦾 A servo moves from 90° to 10°. How many degrees does it turn?
40. 40.🦾 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 left (b) points right (c) points up and left (d) points up and right

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