Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 75 · 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 holds a set angle? (a) a servo motor (b) a DC motor
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
7. 7.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
8. 8.🦾 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 straight up (b) points up and right (c) points left (d) points up and left
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
10. 10.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle − 20
    angle = angle − 10
    angle = angle − 10
    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 DC motor (b) a servo motor
12. 12.🦾 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 right (b) points right (c) points straight up (d) points left
13. 13.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
17. 17.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
18. 18.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
20. 20.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
22. 22.🦾 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 left (b) points straight up (c) points right (d) points up and left
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 = 110
    angle = angle + 20
    angle = angle − 30
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
28. 28.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 40
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
34. 34.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
35. 35.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
36. 36.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
37. 37.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
38. 38.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle − 60
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

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