Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 696 · 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 usually turns 0° to 180°? (a) a DC motor (b) a servo motor
2. 2.🦾 A servo program runs:
   angle = 110
   angle = angle − 40
   angle = angle − 40
   angle = angle + 30
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
6. 6.🦾 A servo moves from 90° to 0°. How many degrees does it turn?
7. 7.🦾 A servo moves from 80° to 0°. How many degrees does it turn?
8. 8.True or false: “has just two wires” 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 45°. Where does the arm point? (a) points up and right (b) points straight up (c) points up and left (d) points right
10. 10.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
11. 11.🦾 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 right (b) points right (c) points left (d) points straight up
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
13. 13.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
14. 14.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
15. 15.🦾 A servo moves from 150° to 10°. How many degrees does it turn?
16. 16.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
17. 17.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 140° to 80°. How many degrees does it turn?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
21. 21.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
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 50°. How many degrees does it turn?
25. 25.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 120
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
31. 31.🦾 A servo moves from 110° to 130°. How many degrees does it turn?
32. 32.🦾 A servo moves from 100° to 40°. How many degrees does it turn?
33. 33.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
34. 34.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
37. 37.🦾 A servo moves from 110° to 50°. How many degrees does it turn?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
39. 39.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle − 40
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 140° to 70°. How many degrees does it turn?

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