Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 586 · 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 = 100
   angle = angle − 30
   angle = angle − 40
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
4. 4.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
5. 5.🦾 A servo moves from 120° to 40°. 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 45°. Where does the arm point? (a) points straight up (b) points left (c) points up and right (d) points right
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 program runs:
   angle = 140
   angle = angle − 50
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
11. 11.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
13. 13.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
15. 15.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
16. 16.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
19. 19.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle + 50
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
24. 24.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo moves from 120° to 110°. How many degrees does it turn?
26. 26.🦾 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 left (b) points right (c) points up and left (d) points straight up
27. 27.True or false: “has a signal wire” 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.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
32. 32.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
33. 33.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
34. 34.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 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 right (b) points left (c) points straight up (d) points up and left
37. 37.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
38. 38.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?

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