Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 459 · 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 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 right (b) points up and left (c) points up and right (d) points straight up
2. 2.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
3. 3.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
4. 4.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
8. 8.🦾 A servo moves from 120° to 80°. How many degrees does it turn?
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
10. 10.🦾 A servo moves from 80° to 150°. How many degrees does it turn?
11. 11.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
12. 12.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
16. 16.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
18. 18.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
19. 19.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
21. 21.🦾 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 up and left (b) points up and right (c) points left (d) points right
22. 22.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
23. 23.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
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 up and left
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
26. 26.🦾 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 straight up (c) points up and left (d) points up and right
27. 27.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle + 20
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 50° to 70°. How many degrees does it turn?
29. 29.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
30. 30.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
32. 32.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
36. 36.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
37. 37.🦾 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 left (c) points up and right (d) points right
38. 38.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle + 60
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 130° to 30°. How many degrees does it turn?

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