Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 230 · 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.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
5. 5.🦾 A servo moves from 120° to 20°. How many degrees does it turn?
6. 6.🦾 A servo program runs:
   angle = 100
   angle = angle − 50
   angle = angle + 20
   angle = angle − 10
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
8. 8.🦾 A servo program runs:
   angle = 70
   angle = angle − 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
10. 10.🦾 A servo moves from 170° to 50°. How many degrees does it turn?
11. 11.True or false: “has just two wires” 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) shake it (c) swap its two wires (d) paint it red
13. 13.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
14. 14.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
16. 16.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
18. 18.🦾 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 straight up (b) points right (c) points left (d) points up and left
19. 19.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
20. 20.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
21. 21.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
24. 24.🦾 A servo moves from 130° to 140°. How many degrees does it turn?
25. 25.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a DC motor (d) a buzzer
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
29. 29.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
30. 30.🦾 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 up and left (c) points straight up (d) points up and right
31. 31.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
32. 32.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
35. 35.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
36. 36.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
37. 37.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 60
    angle = angle + 20
    angle = angle + 50
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 160° to 110°. How many degrees does it turn?

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