Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 345 · 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.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
3. 3.🦾 A servo moves from 110° to 140°. How many degrees does it turn?
4. 4.🦾 A servo moves from 90° to 10°. How many degrees does it turn?
5. 5.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
7. 7.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo program runs:
   angle = 0
   angle = angle + 20
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
10. 10.🦾 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 right (b) points up and left (c) points up and right (d) points straight up
11. 11.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
12. 12.🦾 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 right (b) points straight up (c) points up and left (d) points left
13. 13.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
14. 14.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
15. 15.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
16. 16.🦾 A servo moves from 60° to 0°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
18. 18.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
21. 21.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 30
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
24. 24.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 50
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 20
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
27. 27.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
29. 29.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
30. 30.🦾 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 left
31. 31.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
35. 35.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
37. 37.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 20
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?

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