Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 370 · 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 turns to an exact angle? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo program runs:
   angle = 160
   angle = angle − 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo program runs:
   angle = 110
   angle = angle − 50
   angle = angle + 10
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
5. 5.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
6. 6.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
7. 7.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
8. 8.🦾 A servo program runs:
   angle = 130
   angle = angle − 60
   angle = angle − 20
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
12. 12.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
13. 13.⚙️ 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
14. 14.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle + 20
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
16. 16.🦾 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 up and right (c) points left (d) points right
17. 17.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle − 20
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
20. 20.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle − 60
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 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 up and left (d) points right
23. 23.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
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 straight up (b) points up and left (c) points left (d) points right
25. 25.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
27. 27.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
28. 28.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
30. 30.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
31. 31.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
34. 34.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 150° to 10°. How many degrees does it turn?
36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
37. 37.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
39. 39.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo moves from 70° to 130°. How many degrees does it turn?

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