Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 645 · 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 60°?
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
5. 5.🦾 A servo moves from 160° to 110°. How many degrees does it turn?
6. 6.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
8. 8.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
9. 9.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
10. 10.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
11. 11.🦾 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 left (c) points up and right (d) points straight up
12. 12.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
13. 13.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
14. 14.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
20. 20.🦾 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 up and right (b) points up and left (c) points right (d) points straight up
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
22. 22.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
23. 23.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle + 20
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
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: “reverses if wires swap” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 90° to 10°. How many degrees does it turn?
29. 29.🦾 A servo moves from 10° to 30°. How many degrees does it turn?
30. 30.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
32. 32.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
33. 33.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
34. 34.🦾 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 up and right (b) points left (c) points up and left (d) points right
35. 35.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
36. 36.🦾 A servo moves from 30° to 150°. How many degrees does it turn?
37. 37.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo moves from 70° to 40°. How many degrees does it turn?
39. 39.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
40. 40.🦾 A servo moves from 40° to 170°. How many degrees does it turn?

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