Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 769 · 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: “drives the wheels” is true of a servo motor. (a) False (b) True
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
3. 3.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
4. 4.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
5. 5.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo moves from 160° to 70°. How many degrees does it turn?
7. 7.🦾 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 up and right (d) points straight up
8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
12. 12.🦾 A servo moves from 90° to 110°. How many degrees does it turn?
13. 13.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
15. 15.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
19. 19.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle + 50
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 20
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 40
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
24. 24.🦾 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 right (c) points up and left (d) points left
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
26. 26.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
28. 28.🦾 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 straight up (b) points up and right (c) points left (d) points right
29. 29.🦾 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 right (b) points straight up (c) points up and right (d) points up and left
30. 30.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
31. 31.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 60
    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) False (b) True
33. 33.🦾 A servo moves from 160° to 170°. How many degrees does it turn?
34. 34.🦾 A servo moves from 100° to 90°. How many degrees does it turn?
35. 35.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo moves from 70° to 170°. How many degrees does it turn?
37. 37.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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