Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 377 · 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.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
2. 2.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo program runs:
   angle = 30
   angle = angle + 50
   angle = angle + 10
   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.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
7. 7.🦾 A servo moves from 170° to 90°. How many degrees does it turn?
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
10. 10.🦾 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 straight up (d) points left
11. 11.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
12. 12.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
13. 13.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle + 40
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle + 20
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
24. 24.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
25. 25.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
27. 27.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
28. 28.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
29. 29.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
30. 30.🦾 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 right (b) points left (c) points straight up (d) points up and right
31. 31.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
32. 32.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
33. 33.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 40
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
36. 36.🦾 A servo moves from 160° to 50°. How many degrees does it turn?
37. 37.🦾 A servo moves from 170° to 60°. How many degrees does it turn?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
39. 39.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo moves from 50° to 120°. How many degrees does it turn?

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