Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 434 · 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 90°?
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 light sensor (d) a buzzer
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
5. 5.🦾 A servo moves from 170° to 150°. How many degrees does it turn?
6. 6.🦾 A servo program runs:
   angle = 110
   angle = angle + 20
   angle = angle − 10
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
10. 10.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 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 left (d) points straight up
14. 14.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
16. 16.🦾 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 left (b) points up and left (c) points right (d) points up and right
17. 17.🦾 A servo moves from 180° to 50°. How many degrees does it turn?
18. 18.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 170° to 20°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
28. 28.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
29. 29.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
30. 30.🦾 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 straight up (c) points left (d) points up and left
31. 31.🦾 A servo moves from 10° to 140°. How many degrees does it turn?
32. 32.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
34. 34.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
35. 35.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
36. 36.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
38. 38.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
39. 39.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
40. 40.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor

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