Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 112 · 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 = 30
   angle = angle + 20
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
4. 4.🦾 A servo program runs:
   angle = 40
   angle = angle − 20
   angle = angle + 50
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
6. 6.⚙️ 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
7. 7.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo program runs:
   angle = 30
   angle = angle + 50
   angle = angle − 60
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
15. 15.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
16. 16.🦾 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 straight up (b) points right (c) points up and right (d) points up and left
17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
20. 20.🦾 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 right (b) points up and right (c) points left (d) points straight up
21. 21.🦾 A servo moves from 180° to 120°. How many degrees does it turn?
22. 22.🦾 A servo moves from 80° to 180°. How many degrees does it turn?
23. 23.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
24. 24.🦾 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 left (b) points right (c) points up and left (d) points straight up
25. 25.🦾 A servo moves from 120° to 50°. How many degrees does it turn?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
27. 27.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
28. 28.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
29. 29.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
31. 31.⚙️ 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
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
34. 34.🦾 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 straight up (c) points up and right (d) points up and left
35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
36. 36.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
37. 37.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
38. 38.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle − 30
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?

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