Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 361 · 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 has a signal wire? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
3. 3.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
4. 4.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
5. 5.🦾 A servo program runs:
   angle = 120
   angle = angle − 40
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo program runs:
   angle = 110
   angle = angle − 10
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
8. 8.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
10. 10.🦾 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 up and right (b) points left (c) points up and left (d) points right
11. 11.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
12. 12.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
14. 14.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
15. 15.🦾 A servo moves from 100° to 180°. How many degrees does it turn?
16. 16.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 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 up and right (b) points right (c) points left (d) points up and left
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo moves from 10° to 50°. How many degrees does it turn?
21. 21.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
22. 22.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
23. 23.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
24. 24.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
26. 26.🦾 A servo moves from 70° to 160°. How many degrees does it turn?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
30. 30.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
31. 31.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle + 40
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
34. 34.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
35. 35.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
36. 36.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
37. 37.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False

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