Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 248 · 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: “spins round and round” is true of a servo motor. (a) True (b) False
2. 2.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
5. 5.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
7. 7.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
11. 11.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
12. 12.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
16. 16.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
17. 17.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
18. 18.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
20. 20.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
21. 21.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
22. 22.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 40
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
26. 26.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
28. 28.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
29. 29.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
31. 31.🦾 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 up and left (d) points straight up
32. 32.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
33. 33.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
35. 35.🦾 A servo moves from 20° to 40°. How many degrees does it turn?
36. 36.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
37. 37.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle + 60
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 50
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True

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