Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 146 · 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: “reverses if wires swap” is true of a servo motor. (a) False (b) True
2. 2.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
5. 5.⚙️ 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
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
7. 7.🦾 A servo moves from 10° to 110°. How many degrees does it turn?
8. 8.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
9. 9.🦾 A servo program runs:
   angle = 140
   angle = angle − 20
   angle = angle − 10
   angle = angle − 20
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
11. 11.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
12. 12.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
13. 13.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
14. 14.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.🦾 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 left (c) points straight up (d) points right
17. 17.🦾 A servo moves from 40° to 140°. How many degrees does it turn?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
19. 19.True or false: “has just two wires” 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.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
23. 23.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
24. 24.🦾 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 right (c) points up and right (d) points left
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
26. 26.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
27. 27.🦾 A servo moves from 90° to 0°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
30. 30.🦾 A servo moves from 170° to 70°. How many degrees does it turn?
31. 31.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo moves from 120° to 180°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 130
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 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 straight up (b) points up and right (c) points right (d) points up and left
36. 36.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
37. 37.🦾 A servo moves from 80° to 30°. How many degrees does it turn?
38. 38.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
39. 39.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True

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