Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 294 · 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 moves from 30° to 170°. How many degrees does it turn?
2. 2.🦾 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 up and right (c) points straight up (d) points left
3. 3.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
7. 7.🦾 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 up and right (b) points straight up (c) points left (d) points right
8. 8.🦾 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 up and left (c) points right (d) points straight up
9. 9.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
12. 12.🦾 A servo moves from 90° to 100°. How many degrees does it turn?
13. 13.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
16. 16.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
17. 17.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
23. 23.🦾 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 right (b) points straight up (c) points left (d) points up and left
24. 24.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ 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
26. 26.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
27. 27.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle + 10
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo moves from 10° to 60°. How many degrees does it turn?
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 50
    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 + 20
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo moves from 60° to 170°. How many degrees does it turn?
34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
35. 35.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 40
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle + 50
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?

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