Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 110 · 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 motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
2. 2.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
3. 3.🦾 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 left (b) points up and right (c) points right (d) points straight up
4. 4.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
6. 6.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
8. 8.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
9. 9.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
10. 10.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
13. 13.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.🦾 A servo moves from 30° to 60°. How many degrees does it turn?
16. 16.🦾 A servo moves from 170° to 10°. How many degrees does it turn?
17. 17.🦾 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 up and left (b) points up and right (c) points right (d) points straight up
18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
19. 19.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
20. 20.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 50
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
24. 24.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 60
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
27. 27.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
28. 28.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
30. 30.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
32. 32.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
33. 33.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
34. 34.🦾 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 left (c) points up and right (d) points right
35. 35.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 40
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 160° to 50°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

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