Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 135 · 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 = 0
   angle = angle + 30
   angle = angle + 50
   angle = angle − 40
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
2. 2.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
4. 4.🦾 A servo moves from 10° to 20°. How many degrees does it turn?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
6. 6.🦾 A servo moves from 20° to 160°. How many degrees does it turn?
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo moves from 140° to 120°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
12. 12.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
13. 13.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
14. 14.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
16. 16.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
20. 20.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 50
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
25. 25.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
26. 26.🦾 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 up and left (b) points straight up (c) points up and right (d) points right
27. 27.🦾 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 right (d) points up and left
28. 28.🦾 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 left (c) points left (d) points right
29. 29.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
33. 33.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
34. 34.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
35. 35.🦾 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 left (c) points right (d) points up and right
36. 36.🦾 A servo moves from 50° to 180°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 160° to 90°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 50° to 120°. How many degrees does it turn?

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