Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 368 · 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 servo motor (b) a DC motor
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
3. 3.🦾 A servo program runs:
   angle = 50
   angle = angle + 30
   angle = angle − 40
   angle = angle − 40
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
4. 4.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
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 up and left (c) points straight up (d) points up and right
6. 6.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
9. 9.🦾 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 left (b) points up and right (c) points right (d) points straight up
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
11. 11.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
14. 14.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
15. 15.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo moves from 70° to 180°. How many degrees does it turn?
19. 19.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
20. 20.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo moves from 50° to 170°. How many degrees does it turn?
23. 23.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
24. 24.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
26. 26.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
28. 28.🦾 A servo moves from 10° to 60°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
32. 32.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
33. 33.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
34. 34.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
37. 37.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
38. 38.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
39. 39.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?

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