Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 937 · 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.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo moves from 140° to 50°. How many degrees does it turn?
5. 5.🦾 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 straight up (c) points left (d) points up and left
6. 6.🦾 A servo program runs:
   angle = 100
   angle = angle + 10
   angle = angle − 30
   angle = angle + 60
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
8. 8.🦾 A servo moves from 110° to 30°. How many degrees does it turn?
9. 9.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
10. 10.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
12. 12.🦾 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 right (b) points up and left (c) points straight up (d) points left
13. 13.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
17. 17.⚙️ 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
18. 18.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
20. 20.🦾 A servo moves from 120° to 50°. How many degrees does it turn?
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
23. 23.🦾 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 straight up (c) points up and left (d) points right
24. 24.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
26. 26.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
29. 29.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
30. 30.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 20
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ 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
33. 33.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle + 10
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
35. 35.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo program runs:
    angle = 50
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo moves from 70° to 150°. How many degrees does it turn?
39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo program runs:
    angle = 90
    angle = angle + 50
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?

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