Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 319 · 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: “moves an arm joint” is true of a DC motor. (a) True (b) False
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
6. 6.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
9. 9.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo moves from 130° to 40°. How many degrees does it turn?
12. 12.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
13. 13.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
14. 14.🦾 A servo program runs:
    angle = 90
    angle = angle − 10
    angle = angle + 50
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
17. 17.🦾 A servo moves from 30° to 60°. How many degrees does it turn?
18. 18.🦾 A servo moves from 40° to 150°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
20. 20.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
21. 21.🦾 A servo moves from 90° to 160°. How many degrees does it turn?
22. 22.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 60
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 120° to 100°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
26. 26.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 30
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 150° to 60°. How many degrees does it turn?
30. 30.🦾 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 up and right (c) points up and left (d) points straight up
31. 31.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
35. 35.🦾 A servo program runs:
    angle = 60
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
37. 37.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo moves from 130° to 120°. How many degrees does it turn?
39. 39.🦾 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 left (c) points up and right (d) points up and left
40. 40.🦾 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

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