Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 154 · 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.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
2. 2.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
3. 3.⚙️ 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
4. 4.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
5. 5.🦾 A servo moves from 130° to 70°. How many degrees does it turn?
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
7. 7.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
10. 10.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
11. 11.🦾 A servo program runs:
    angle = 60
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
13. 13.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo moves from 10° to 50°. How many degrees does it turn?
16. 16.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
17. 17.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 50
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
21. 21.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
22. 22.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
25. 25.🦾 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 left (c) points right (d) points straight up
26. 26.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
29. 29.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
30. 30.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
33. 33.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
34. 34.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 50
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo moves from 140° to 60°. How many degrees does it turn?
40. 40.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True

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