Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 173 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
2. 2.🦾 A servo program runs:
   angle = 150
   angle = angle + 20
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
3. 3.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
5. 5.⚙️ 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
6. 6.🦾 A servo program runs:
   angle = 170
   angle = angle − 40
   angle = angle − 60
   angle = angle − 50
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo moves from 0° to 70°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
10. 10.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
12. 12.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
13. 13.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
15. 15.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
22. 22.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 150° to 180°. How many degrees does it turn?
24. 24.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo moves from 150° to 80°. How many degrees does it turn?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
27. 27.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
28. 28.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle − 10
    angle = angle + 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 50° to 90°. How many degrees does it turn?
30. 30.🦾 A servo moves from 0° to 10°. How many degrees does it turn?
31. 31.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 20
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 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 up and right (b) points up and left (c) points right (d) points left
33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
34. 34.🦾 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 up and left (b) points right (c) points straight up (d) points up and right
35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 60
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
39. 39.🦾 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 right (c) points up and left (d) points straight up
40. 40.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False

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