Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 278 · 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: “spins round and round” is true of a servo motor. (a) False (b) True
2. 2.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
4. 4.🦾 A servo program runs:
   angle = 100
   angle = angle + 60
   angle = angle − 60
   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.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo program runs:
   angle = 170
   angle = angle − 30
   angle = angle − 60
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
11. 11.🦾 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 up and left (c) points right (d) points left
12. 12.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
14. 14.🦾 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 straight up (d) points left
15. 15.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 50° to 170°. How many degrees does it turn?
20. 20.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle − 40
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
23. 23.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
24. 24.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
26. 26.🦾 A servo moves from 10° to 0°. How many degrees does it turn?
27. 27.🦾 A servo moves from 90° to 50°. How many degrees does it turn?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
29. 29.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 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 right (b) points straight up (c) points up and left (d) points left
31. 31.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
32. 32.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
35. 35.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
36. 36.🦾 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 straight up (b) points up and right (c) points right (d) points left
37. 37.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle − 50
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle + 50
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 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 left (c) points right (d) points up and right
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?

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