Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 440 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
4. 4.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
6. 6.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
7. 7.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
8. 8.🦾 A servo program runs:
   angle = 20
   angle = angle + 60
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
17. 17.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo moves from 150° to 60°. How many degrees does it turn?
19. 19.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo moves from 130° to 100°. How many degrees does it turn?
22. 22.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
23. 23.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
24. 24.🦾 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 straight up (b) points up and right (c) points up and left (d) points left
25. 25.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
28. 28.🦾 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 right (b) points left (c) points up and right (d) points straight up
29. 29.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle − 30
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo moves from 170° to 20°. How many degrees does it turn?
31. 31.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 50
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 70
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
34. 34.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
35. 35.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 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 left (c) points straight up (d) points up and left
38. 38.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor

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