Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 381 · 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: “moves an arm joint” is true of a servo motor. (a) False (b) True
2. 2.🦾 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 right (b) points straight up (c) points up and left (d) points left
3. 3.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
4. 4.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
5. 5.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
6. 6.🦾 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 left (c) points up and left (d) points right
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
8. 8.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
9. 9.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.🦾 A servo moves from 90° to 150°. How many degrees does it turn?
12. 12.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
13. 13.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
14. 14.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
15. 15.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 50
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
17. 17.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
18. 18.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
22. 22.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
24. 24.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
30. 30.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
31. 31.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
32. 32.🦾 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 straight up (b) points left (c) points up and right (d) points up and left
33. 33.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
35. 35.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
36. 36.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
37. 37.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
39. 39.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 70° to 10°. How many degrees does it turn?

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