Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 448 · 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 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
2. 2.🦾 A servo moves from 160° to 140°. How many degrees does it turn?
3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
4. 4.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo program runs:
   angle = 40
   angle = angle + 60
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
6. 6.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
7. 7.🦾 A servo program runs:
   angle = 0
   angle = angle + 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
9. 9.🦾 A servo program runs:
   angle = 30
   angle = angle − 20
   angle = angle + 40
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 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 right (b) points right (c) points up and left (d) points left
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
12. 12.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
13. 13.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
14. 14.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
16. 16.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
17. 17.🦾 A servo moves from 30° to 60°. How many degrees does it turn?
18. 18.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
20. 20.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
22. 22.🦾 A servo moves from 30° to 150°. How many degrees does it turn?
23. 23.🦾 A servo program runs:
    angle = 130
    angle = angle + 30
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
25. 25.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
26. 26.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
27. 27.🦾 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 left (b) points up and right (c) points left (d) points straight up
28. 28.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
29. 29.🦾 A servo moves from 170° to 150°. How many degrees does it turn?
30. 30.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo moves from 130° to 180°. How many degrees does it turn?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
39. 39.🦾 A servo moves from 40° to 90°. How many degrees does it turn?
40. 40.🦾 A servo moves from 80° to 40°. How many degrees does it turn?

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