Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 706 · 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: “holds a set angle” is true of a DC motor. (a) False (b) True
2. 2.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
3. 3.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
5. 5.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
6. 6.🦾 A servo program runs:
   angle = 70
   angle = angle − 50
   angle = angle + 60
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
8. 8.⚙️ 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
9. 9.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
11. 11.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo moves from 160° to 90°. How many degrees does it turn?
13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo moves from 70° to 160°. How many degrees does it turn?
15. 15.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
18. 18.🦾 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 left (c) points up and right (d) points right
19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 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 right (c) points straight up (d) points up and left
22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
24. 24.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
25. 25.🦾 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 right (c) points straight up (d) points left
26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
28. 28.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
29. 29.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
30. 30.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
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 right (b) points right (c) points left (d) points straight up
33. 33.🦾 A servo moves from 100° to 180°. How many degrees does it turn?
34. 34.⚙️ 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
35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
36. 36.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
37. 37.🦾 A servo moves from 110° to 180°. How many degrees does it turn?
38. 38.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?

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