Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 137 · 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 10° to 100°. How many degrees does it turn?
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
3. 3.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
4. 4.🦾 A servo program runs:
   angle = 40
   angle = angle − 10
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 A servo moves from 170° to 150°. How many degrees does it turn?
6. 6.🦾 A servo program runs:
   angle = 80
   angle = angle − 40
   angle = angle − 30
   angle = angle + 20
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
8. 8.🦾 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 straight up (c) points up and right (d) points right
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
10. 10.🦾 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 right
11. 11.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
17. 17.🦾 A servo program runs:
    angle = 60
    angle = angle + 60
    angle = angle − 20
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
19. 19.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
20. 20.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
22. 22.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
24. 24.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
25. 25.🦾 A servo moves from 170° to 10°. How many degrees does it turn?
26. 26.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
27. 27.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
29. 29.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
30. 30.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
31. 31.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
32. 32.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo moves from 110° to 30°. How many degrees does it turn?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 10
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo moves from 100° to 130°. How many degrees does it turn?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
40. 40.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True

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