Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 259 · 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 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 right (c) points left (d) points straight up
2. 2.🦾 A servo program runs:
   angle = 180
   angle = angle − 40
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
5. 5.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
6. 6.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
8. 8.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
9. 9.🦾 A servo moves from 170° to 20°. How many degrees does it turn?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
12. 12.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
13. 13.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
14. 14.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
15. 15.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo moves from 50° to 170°. How many degrees does it turn?
18. 18.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
20. 20.⚙️ 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
21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
25. 25.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
26. 26.🦾 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 left (b) points up and left (c) points right (d) points straight up
27. 27.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
29. 29.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
30. 30.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
31. 31.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
32. 32.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
35. 35.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
36. 36.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle + 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 120° to 130°. How many degrees does it turn?
38. 38.🦾 A servo moves from 40° to 90°. How many degrees does it turn?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
40. 40.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False

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