Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 813 · 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 reverses if wires swap? (a) a DC motor (b) a servo motor
2. 2.🦾 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 right (b) points up and right (c) points up and left (d) points straight up
3. 3.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
4. 4.⚙️ 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
5. 5.🦾 A servo program runs:
   angle = 80
   angle = angle + 50
   angle = angle − 10
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
7. 7.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
9. 9.🦾 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
10. 10.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
12. 12.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
13. 13.🦾 A servo program runs:
    angle = 60
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
16. 16.🦾 A servo moves from 120° to 30°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
18. 18.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
20. 20.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
22. 22.🦾 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 left (b) points up and left (c) points up and right (d) points right
23. 23.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
24. 24.🦾 A servo program runs:
    angle = 80
    angle = angle + 30
    angle = angle − 10
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
27. 27.🦾 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 straight up (c) points left (d) points right
28. 28.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo moves from 40° to 100°. How many degrees does it turn?
35. 35.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
40. 40.🦾 A servo moves from 60° to 110°. How many degrees does it turn?

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