Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 415 · 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: “holds a set angle” is true of a servo motor. (a) True (b) False
2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
3. 3.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
4. 4.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
5. 5.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
6. 6.🦾 A servo moves from 150° to 120°. How many degrees does it turn?
7. 7.🦾 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 straight up (c) points up and left (d) points up and right
8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
11. 11.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
12. 12.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
13. 13.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
16. 16.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
17. 17.🦾 A servo program runs:
    angle = 80
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo moves from 140° to 0°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle − 60
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
25. 25.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
27. 27.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
29. 29.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 50
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 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 right (b) points straight up (c) points up and left (d) points left
31. 31.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 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 straight up (c) points up and right (d) points up and left
33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
34. 34.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
36. 36.True or false: “turns to an exact angle” 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 servo motor (b) a DC motor
38. 38.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
39. 39.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 40
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

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