Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 631 · 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 program runs:
   angle = 80
   angle = angle + 50
   angle = angle − 10
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
2. 2.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
4. 4.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
6. 6.🦾 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 left (b) points right (c) points up and right (d) points straight up
7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
9. 9.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
10. 10.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
12. 12.🦾 A servo moves from 130° to 40°. How many degrees does it turn?
13. 13.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
14. 14.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
16. 16.🦾 A servo moves from 0° to 10°. How many degrees does it turn?
17. 17.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
19. 19.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
20. 20.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
23. 23.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
27. 27.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
28. 28.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
29. 29.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
31. 31.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo moves from 160° to 150°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
36. 36.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
37. 37.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo moves from 40° to 160°. How many degrees does it turn?

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