Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 214 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
2. 2.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
3. 3.🦾 A servo program runs:
   angle = 110
   angle = angle − 10
   angle = angle − 10
   angle = angle − 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
5. 5.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
6. 6.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
7. 7.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
8. 8.🦾 A servo program runs:
   angle = 130
   angle = angle + 40
   angle = angle − 30
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
12. 12.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 20
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
15. 15.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
16. 16.🦾 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 up and right (c) points up and left (d) points left
17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo moves from 90° to 150°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle − 50
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
21. 21.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
24. 24.🦾 A servo moves from 90° to 40°. How many degrees does it turn?
25. 25.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
26. 26.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
27. 27.🦾 A servo moves from 170° to 90°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle + 10
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
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 straight up (b) points left (c) points up and left (d) points up and right
30. 30.🦾 A servo program runs:
    angle = 90
    angle = angle + 50
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle + 40
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 60
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle − 60
    angle = angle + 40
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
38. 38.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?

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