Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 277 · 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 = 100
   angle = angle + 20
   angle = angle − 20
   angle = angle + 40
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
3. 3.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
8. 8.🦾 A servo program runs:
   angle = 150
   angle = angle − 60
   angle = angle − 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
10. 10.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
13. 13.🦾 A servo moves from 120° to 10°. How many degrees does it turn?
14. 14.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo moves from 30° to 40°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
19. 19.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
20. 20.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
21. 21.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
22. 22.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
23. 23.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
24. 24.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
28. 28.🦾 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 left (b) points right (c) points straight up (d) points up and left
29. 29.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
32. 32.🦾 A servo moves from 10° to 20°. How many degrees does it turn?
33. 33.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
34. 34.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
36. 36.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
37. 37.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 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 straight up (b) points up and right (c) points right (d) points left
40. 40.🦾 A servo moves from 40° to 150°. How many degrees does it turn?

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