Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 962 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
6. 6.🦾 A servo moves from 50° to 150°. How many degrees does it turn?
7. 7.🦾 A servo moves from 0° to 120°. How many degrees does it turn?
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
9. 9.🦾 A servo moves from 10° to 60°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
11. 11.🦾 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 left (c) points right (d) points straight up
12. 12.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
14. 14.🦾 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 right (c) points left (d) points up and right
15. 15.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
16. 16.🦾 A servo moves from 160° to 180°. How many degrees does it turn?
17. 17.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
18. 18.🦾 A servo program runs:
    angle = 130
    angle = angle − 40
    angle = angle − 20
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
20. 20.🦾 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 straight up (b) points left (c) points right (d) points up and left
21. 21.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
22. 22.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
23. 23.🦾 A servo moves from 0° to 10°. How many degrees does it turn?
24. 24.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
25. 25.🦾 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 right (c) points left (d) points up and right
26. 26.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 30
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
28. 28.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
29. 29.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
31. 31.🦾 A servo moves from 40° to 90°. How many degrees does it turn?
32. 32.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 170° to 150°. How many degrees does it turn?
37. 37.🦾 A servo moves from 120° to 10°. How many degrees does it turn?
38. 38.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
40. 40.🦾 A servo moves from 10° to 100°. How many degrees does it turn?

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