Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 350 · 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 drives the wheels? (a) a servo motor (b) a DC motor
2. 2.🦾 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 right (c) points left (d) points right
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
5. 5.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
6. 6.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
8. 8.🦾 A servo moves from 110° to 60°. How many degrees does it turn?
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
11. 11.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
12. 12.⚙️ 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
13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
15. 15.🦾 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 up and right (d) points straight up
16. 16.🦾 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 up and left (b) points right (c) points left (d) points up and right
17. 17.⚙️ DC motor or servo motor: which one has just two wires? (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 180°?
19. 19.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
21. 21.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
23. 23.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
24. 24.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points up and left (b) points straight up (c) points right (d) points left
25. 25.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 100° to 130°. How many degrees does it turn?
27. 27.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
30. 30.🦾 A servo moves from 20° to 80°. How many degrees does it turn?
31. 31.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 10
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo moves from 20° to 140°. How many degrees does it turn?
33. 33.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
34. 34.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
35. 35.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
36. 36.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo moves from 180° to 0°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
40. 40.🦾 A servo moves from 150° to 120°. How many degrees does it turn?

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