Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 142 · 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.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
2. 2.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
3. 3.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
4. 4.🦾 A servo program runs:
   angle = 90
   angle = angle − 40
   angle = angle + 50
   angle = angle + 60
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
6. 6.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
8. 8.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
9. 9.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.⚙️ 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
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
13. 13.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 60° to 170°. How many degrees does it turn?
15. 15.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
21. 21.🦾 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 straight up (b) points right (c) points left (d) points up and right
22. 22.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
23. 23.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
24. 24.🦾 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 left (b) points right (c) points straight up (d) points left
25. 25.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
27. 27.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
29. 29.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
31. 31.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
32. 32.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
33. 33.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 50
    angle = angle − 30
    angle = angle − 60
    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 90°?
35. 35.🦾 A servo program runs:
    angle = 70
    angle = angle − 30
    angle = angle + 50
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo moves from 120° to 60°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 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 straight up (d) points up and left
40. 40.🦾 A servo moves from 120° to 180°. How many degrees does it turn?

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