Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 119 · 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 = 140
   angle = angle − 50
   angle = angle − 40
   angle = angle + 40
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
3. 3.🦾 A servo program runs:
   angle = 30
   angle = angle − 30
   angle = angle + 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
5. 5.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
6. 6.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
7. 7.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo program runs:
   angle = 90
   angle = angle − 30
   angle = angle − 20
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
10. 10.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
11. 11.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
12. 12.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 30
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
15. 15.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
18. 18.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
19. 19.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
20. 20.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 20
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
24. 24.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
25. 25.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
26. 26.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle + 10
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
28. 28.🦾 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 left (b) points left (c) points straight up (d) points right
29. 29.🦾 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 straight up (c) points up and left (d) points left
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
31. 31.🦾 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 right (b) points right (c) points up and left (d) points straight up
32. 32.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 10
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle + 20
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 40
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
38. 38.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
39. 39.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
40. 40.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True

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