Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 430 · 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 usually turns 0° to 180°? (a) a DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
3. 3.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
5. 5.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
7. 7.🦾 A servo program runs:
   angle = 40
   angle = angle − 10
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo program runs:
   angle = 30
   angle = angle − 10
   angle = angle − 10
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.🦾 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 left (b) points right (c) points straight up (d) points up and right
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
13. 13.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
14. 14.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
15. 15.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
17. 17.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
18. 18.🦾 A servo moves from 20° to 70°. How many degrees does it turn?
19. 19.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
20. 20.🦾 A servo moves from 100° to 150°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 170° to 150°. How many degrees does it turn?
23. 23.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
24. 24.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
25. 25.🦾 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 straight up (c) points up and left (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.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
28. 28.⚙️ 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
29. 29.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
30. 30.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
31. 31.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle − 60
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
34. 34.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
37. 37.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 110
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 60° to 80°. How many degrees does it turn?

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