Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 573 · 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 program runs:
   angle = 40
   angle = angle + 20
   angle = angle + 10
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 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 left (b) points straight up (c) points right (d) points up and right
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
5. 5.🦾 A servo program runs:
   angle = 160
   angle = angle − 30
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
6. 6.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
10. 10.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
11. 11.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle + 20
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo moves from 20° to 70°. How many degrees does it turn?
13. 13.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle + 50
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
18. 18.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo moves from 180° to 140°. How many degrees does it turn?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
21. 21.🦾 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 straight up (c) points right (d) points up and left
22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
25. 25.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
27. 27.🦾 A servo moves from 120° to 90°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
29. 29.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
30. 30.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
32. 32.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 150° to 60°. How many degrees does it turn?
40. 40.🦾 A servo moves from 100° to 90°. How many degrees does it turn?

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