Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 438 · 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 90°?
2. 2.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
4. 4.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
5. 5.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
6. 6.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
7. 7.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
9. 9.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
11. 11.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ 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
15. 15.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle − 50
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
19. 19.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
20. 20.🦾 A servo moves from 160° to 140°. How many degrees does it turn?
21. 21.🦾 A servo moves from 160° to 100°. How many degrees does it turn?
22. 22.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
24. 24.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
25. 25.🦾 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 straight up (c) points left (d) points up and right
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
27. 27.🦾 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 left (b) points up and left (c) points up and right (d) points straight up
28. 28.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
31. 31.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo moves from 140° to 80°. How many degrees does it turn?
33. 33.🦾 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 up and right (b) points up and left (c) points right (d) points left
34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
37. 37.🦾 A servo moves from 100° to 180°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 90
    angle = angle + 50
    angle = angle − 60
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
40. 40.🦾 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 right (b) points left (c) points up and left (d) points up and right

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