Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 768 · 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 60°?
2. 2.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
3. 3.🦾 A servo moves from 100° to 150°. How many degrees does it turn?
4. 4.🦾 A servo program runs:
   angle = 150
   angle = angle − 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
6. 6.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
7. 7.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
8. 8.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
9. 9.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
13. 13.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle + 40
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
18. 18.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
20. 20.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
21. 21.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
23. 23.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
24. 24.🦾 A servo program runs:
    angle = 120
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
26. 26.🦾 A servo moves from 140° to 60°. How many degrees does it turn?
27. 27.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
28. 28.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
30. 30.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
31. 31.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
32. 32.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
33. 33.⚙️ 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
34. 34.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
36. 36.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
38. 38.🦾 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 left (b) points right (c) points straight up (d) points up and left
39. 39.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 40
    angle = angle − 10
    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 120°?

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