Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 378 · 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 program runs:
   angle = 130
   angle = angle + 10
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
4. 4.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
8. 8.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
9. 9.🦾 A servo program runs:
   angle = 10
   angle = angle + 20
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
10. 10.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ 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
16. 16.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
17. 17.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
18. 18.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
19. 19.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 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 right (d) points up and right
21. 21.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
22. 22.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
24. 24.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
26. 26.True or false: “spins faster with more V” 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 right (b) points straight up (c) points up and left (d) points right
28. 28.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
30. 30.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo moves from 90° to 70°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
34. 34.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
35. 35.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo moves from 80° to 150°. How many degrees does it turn?
37. 37.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
38. 38.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
40. 40.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan

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