Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 443 · 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 moves from 50° to 110°. How many degrees does it turn?
2. 2.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
3. 3.🦾 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 left (b) points straight up (c) points right (d) points up and right
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
6. 6.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
7. 7.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
8. 8.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (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 30°?
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
12. 12.🦾 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 left (b) points right (c) points left (d) points straight up
13. 13.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
15. 15.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo moves from 180° to 90°. How many degrees does it turn?
20. 20.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
22. 22.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
24. 24.🦾 A servo moves from 100° to 10°. How many degrees does it turn?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
29. 29.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 170° to 80°. How many degrees does it turn?
34. 34.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
35. 35.🦾 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
36. 36.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
39. 39.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
40. 40.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True

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