Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 500 · 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.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
2. 2.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
3. 3.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
7. 7.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
8. 8.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
11. 11.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
12. 12.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
13. 13.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
14. 14.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo moves from 90° to 40°. How many degrees does it turn?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 40° to 120°. How many degrees does it turn?
23. 23.🦾 A servo moves from 30° to 80°. How many degrees does it turn?
24. 24.🦾 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 right (c) points straight up (d) points up and right
25. 25.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle − 20
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 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 up and left
30. 30.🦾 A servo moves from 10° to 120°. How many degrees does it turn?
31. 31.🦾 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 straight up (b) points up and right (c) points up and left (d) points right
32. 32.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 100° to 80°. How many degrees does it turn?
34. 34.🦾 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 up and left (b) points left (c) points right (d) points up and right
35. 35.🦾 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
36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
37. 37.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle − 30
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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