Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 502 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
2. 2.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
3. 3.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
4. 4.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
5. 5.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
6. 6.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
7. 7.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo program runs:
   angle = 160
   angle = angle + 20
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
15. 15.🦾 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 straight up (d) points right
16. 16.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 30
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
20. 20.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 30
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
23. 23.🦾 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
24. 24.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle + 20
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
27. 27.🦾 A servo moves from 90° to 70°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 150° to 10°. How many degrees does it turn?
30. 30.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 40
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
34. 34.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 130° to 170°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
38. 38.🦾 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 straight up (c) points left (d) points right
39. 39.🦾 A servo moves from 140° to 160°. How many degrees does it turn?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

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