Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 186 · 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 holds a set angle? (a) a servo motor (b) a DC motor
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
3. 3.🦾 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 up and right (c) points right (d) points up and left
4. 4.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
6. 6.🦾 A servo moves from 120° to 160°. How many degrees does it turn?
7. 7.🦾 A servo program runs:
   angle = 80
   angle = angle − 60
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
12. 12.🦾 A servo moves from 0° to 130°. How many degrees does it turn?
13. 13.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
14. 14.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
15. 15.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
17. 17.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
18. 18.🦾 A servo moves from 100° to 120°. How many degrees does it turn?
19. 19.🦾 A servo moves from 170° to 50°. How many degrees does it turn?
20. 20.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
21. 21.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
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 spins faster with more V? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
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 right (b) points left (c) points straight up (d) points right
28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 30
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
31. 31.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo moves from 50° to 0°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
39. 39.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
40. 40.True or false: “has just two wires” is true of a servo motor. (a) False (b) True

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