Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 496 · 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 45°. Where does the arm point? (a) points straight up (b) points up and right (c) points up and left (d) points right
2. 2.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
3. 3.🦾 A servo program runs:
   angle = 130
   angle = angle − 60
   angle = angle + 20
   angle = angle + 10
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo program runs:
   angle = 110
   angle = angle − 60
   angle = angle + 10
   angle = angle + 40
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 A servo moves from 50° to 180°. How many degrees does it turn?
6. 6.🦾 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 straight up (b) points left (c) points right (d) points up and left
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
8. 8.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
9. 9.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
11. 11.🦾 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 up and left (b) points left (c) points straight up (d) points right
12. 12.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
15. 15.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
17. 17.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
19. 19.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
23. 23.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 20
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
29. 29.🦾 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 straight up (b) points left (c) points right (d) points up and left
30. 30.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 40
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
32. 32.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
33. 33.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
34. 34.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
37. 37.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo moves from 180° to 60°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?

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