Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 286 · 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 = 40
   angle = angle − 40
   angle = angle + 10
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 A servo moves from 80° to 180°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
4. 4.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
5. 5.🦾 A servo moves from 110° to 50°. How many degrees does it turn?
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 up and left (b) points left (c) points up and right (d) points right
7. 7.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
8. 8.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
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 up and right (b) points straight up (c) points up and left (d) points left
10. 10.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
11. 11.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
14. 14.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
17. 17.🦾 A servo moves from 50° to 0°. How many degrees does it turn?
18. 18.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
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 turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
22. 22.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
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 right (b) points up and left (c) points straight up (d) points up and right
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
26. 26.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
29. 29.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
30. 30.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo moves from 90° to 60°. How many degrees does it turn?
33. 33.🦾 A servo moves from 100° to 130°. How many degrees does it turn?
34. 34.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 60
    angle = angle − 30
    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 DC motor (b) a servo motor
39. 39.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo program runs:
    angle = 80
    angle = angle + 30
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?

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