Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 749 · 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 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 right (c) points up and left (d) points straight up
2. 2.⚙️ 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
3. 3.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.🦾 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 up and right (c) points right (d) points left
7. 7.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
8. 8.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
9. 9.🦾 A servo program runs:
   angle = 80
   angle = angle − 20
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
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 = 170
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo moves from 80° to 30°. How many degrees does it turn?
13. 13.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
14. 14.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
17. 17.🦾 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 right (b) points up and right (c) points straight up (d) points left
18. 18.⚙️ 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
19. 19.🦾 A servo moves from 40° to 150°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
21. 21.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
23. 23.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
25. 25.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
27. 27.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 10
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
29. 29.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 30
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 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 right (b) points left (c) points up and left (d) points straight up
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo moves from 50° to 120°. How many degrees does it turn?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
36. 36.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
40. 40.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False

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