Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 326 · 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.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
3. 3.🦾 A servo program runs:
   angle = 90
   angle = angle − 40
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ 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
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
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 servo motor. (a) False (b) True
8. 8.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
14. 14.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
17. 17.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
18. 18.🦾 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 up and right (b) points left (c) points straight up (d) points up and left
19. 19.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
20. 20.🦾 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 up and right (c) points right (d) points left
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
22. 22.🦾 A servo moves from 50° to 100°. How many degrees does it turn?
23. 23.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 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 right (c) points up and left (d) points straight up
25. 25.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
27. 27.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
29. 29.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
30. 30.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
31. 31.🦾 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 right (b) points up and left (c) points straight up (d) points left
32. 32.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
34. 34.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
35. 35.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
36. 36.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
37. 37.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo moves from 0° to 130°. How many degrees does it turn?
39. 39.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
40. 40.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red

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