Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 225 · 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: “reverses if wires swap” is true of a servo motor. (a) True (b) False
2. 2.🦾 A servo program runs:
   angle = 180
   angle = angle − 40
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
4. 4.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
5. 5.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
6. 6.🦾 A servo program runs:
   angle = 140
   angle = angle + 30
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
8. 8.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
9. 9.🦾 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 left
10. 10.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
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 right (b) points up and right (c) points straight up (d) points up and left
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
14. 14.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
19. 19.🦾 A servo moves from 100° to 110°. How many degrees does it turn?
20. 20.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
23. 23.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
25. 25.🦾 A servo moves from 10° to 150°. How many degrees does it turn?
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
27. 27.🦾 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 left (c) points left (d) points up and right
28. 28.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
30. 30.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.🦾 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 up and left (c) points straight up (d) points right
36. 36.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
39. 39.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
40. 40.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°

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