Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 284 · 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 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 right (c) points up and left (d) points straight up
2. 2.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
5. 5.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
6. 6.🦾 A servo program runs:
   angle = 30
   angle = angle − 20
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
8. 8.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
9. 9.🦾 A servo moves from 120° to 150°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
11. 11.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
12. 12.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
13. 13.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
16. 16.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
18. 18.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
19. 19.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
20. 20.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
21. 21.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
24. 24.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
25. 25.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
26. 26.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
27. 27.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
29. 29.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (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 90°. Where does the arm point? (a) points left (b) points right (c) points straight up (d) points up and left
31. 31.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
32. 32.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
33. 33.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
35. 35.🦾 A servo moves from 80° to 10°. How many degrees does it turn?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
37. 37.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 60
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
40. 40.🦾 A servo moves from 40° to 160°. How many degrees does it turn?

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