Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 272 · 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.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
3. 3.🦾 A servo program runs:
   angle = 180
   angle = angle − 10
   angle = angle − 50
   angle = angle + 60
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
5. 5.🦾 A servo moves from 140° to 110°. How many degrees does it turn?
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
7. 7.🦾 A servo moves from 180° to 40°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
9. 9.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
16. 16.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
17. 17.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
18. 18.🦾 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 straight up (b) points right (c) points left (d) points up and right
19. 19.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
20. 20.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
21. 21.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
24. 24.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo moves from 70° to 130°. How many degrees does it turn?
27. 27.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 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 left (b) points up and right (c) points straight up (d) points up and left
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
31. 31.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo moves from 130° to 40°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
35. 35.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle + 40
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo moves from 100° to 40°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor

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