Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 723 · 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 150°?
2. 2.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
3. 3.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
4. 4.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
6. 6.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
7. 7.⚙️ 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
8. 8.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
9. 9.🦾 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 straight up (c) points left (d) points up and right
10. 10.🦾 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 left (b) points straight up (c) points up and left (d) points right
11. 11.🦾 A servo moves from 140° to 70°. How many degrees does it turn?
12. 12.🦾 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 right (b) points left (c) points straight up (d) points up and left
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
14. 14.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
15. 15.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
18. 18.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
19. 19.🦾 A servo moves from 70° to 140°. How many degrees does it turn?
20. 20.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
22. 22.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
23. 23.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
25. 25.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo moves from 90° to 10°. How many degrees does it turn?
29. 29.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
30. 30.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
31. 31.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo moves from 80° to 150°. How many degrees does it turn?
33. 33.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
34. 34.🦾 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 straight up (c) points up and left (d) points left
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
36. 36.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
37. 37.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
38. 38.🦾 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 up and left (c) points left (d) points straight up
39. 39.🦾 A servo program runs:
    angle = 120
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 160° to 100°. How many degrees does it turn?

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