Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 795 · 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 = 50
   angle = angle + 40
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 A servo program runs:
   angle = 50
   angle = angle − 10
   angle = angle + 60
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ 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
4. 4.🦾 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
5. 5.🦾 A servo program runs:
   angle = 170
   angle = angle + 10
   angle = angle − 60
   angle = angle − 40
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
8. 8.🦾 A servo moves from 30° to 150°. How many degrees does it turn?
9. 9.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
11. 11.🦾 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 up and left (b) points up and right (c) points straight up (d) points left
12. 12.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo moves from 10° to 140°. How many degrees does it turn?
14. 14.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
15. 15.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
16. 16.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
18. 18.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 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 left (b) points right (c) points straight up (d) points up and left
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 has a signal wire? (a) a servo motor (b) a DC motor
22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
24. 24.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
26. 26.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
28. 28.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 30
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
33. 33.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 60
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
36. 36.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo moves from 30° to 130°. How many degrees does it turn?
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
40. 40.🦾 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 straight up (c) points left (d) points right

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