Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 213 · 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 moves from 150° to 140°. How many degrees does it turn?
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
3. 3.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
4. 4.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
6. 6.🦾 A servo program runs:
   angle = 180
   angle = angle − 50
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo program runs:
   angle = 160
   angle = angle + 20
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 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 up and left (c) points up and right (d) points straight up
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
10. 10.🦾 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 left (c) points right (d) points up and left
11. 11.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
12. 12.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
13. 13.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
16. 16.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
17. 17.🦾 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 up and left (c) points left (d) points right
18. 18.🦾 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 right (b) points left (c) points up and left (d) points right
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
20. 20.🦾 A servo moves from 150° to 120°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
23. 23.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
25. 25.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
26. 26.🦾 A servo moves from 20° to 70°. How many degrees does it turn?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
28. 28.🦾 A servo moves from 110° to 130°. How many degrees does it turn?
29. 29.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
30. 30.🦾 A servo moves from 170° to 80°. How many degrees does it turn?
31. 31.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
32. 32.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
33. 33.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
36. 36.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
37. 37.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
39. 39.🦾 A servo moves from 0° to 120°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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