Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 429 · 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.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
2. 2.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.🦾 A servo program runs:
   angle = 150
   angle = angle − 60
   angle = angle − 50
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
6. 6.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
8. 8.🦾 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 right (b) points left (c) points straight up (d) points up and right
9. 9.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
10. 10.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
13. 13.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo moves from 180° to 60°. How many degrees does it turn?
15. 15.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
17. 17.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
18. 18.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
19. 19.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
20. 20.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
24. 24.🦾 A servo moves from 10° to 160°. How many degrees does it turn?
25. 25.🦾 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 straight up (c) points right (d) points up and left
26. 26.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
27. 27.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
28. 28.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
29. 29.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
31. 31.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
32. 32.🦾 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 straight up (c) points right (d) points left
33. 33.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle + 50
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 110° to 20°. How many degrees does it turn?
36. 36.🦾 A servo moves from 130° to 30°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle + 50
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
40. 40.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°

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