Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 830 · 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.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
2. 2.🦾 A servo moves from 170° to 150°. How many degrees does it turn?
3. 3.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
4. 4.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
8. 8.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
9. 9.🦾 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 up and left (b) points left (c) points right (d) points straight up
10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo moves from 50° to 90°. How many degrees does it turn?
12. 12.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle + 50
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
16. 16.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
17. 17.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo moves from 80° to 0°. How many degrees does it turn?
19. 19.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points left (b) points up and left (c) points up and right (d) points right
22. 22.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
23. 23.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
24. 24.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo moves from 150° to 90°. How many degrees does it turn?
27. 27.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
29. 29.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
30. 30.🦾 A servo moves from 40° to 70°. How many degrees does it turn?
31. 31.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
35. 35.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
37. 37.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
38. 38.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
40. 40.🦾 A servo moves from 180° to 130°. How many degrees does it turn?

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