Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 187 · 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 reverses if wires swap? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo moves from 50° to 80°. How many degrees does it turn?
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
4. 4.⚙️ 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
5. 5.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
6. 6.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo program runs:
   angle = 100
   angle = angle − 60
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
11. 11.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
14. 14.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
15. 15.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
17. 17.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
18. 18.🦾 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 straight up (b) points right (c) points up and right (d) points left
19. 19.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
20. 20.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
21. 21.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 50
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
26. 26.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
28. 28.🦾 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 left (b) points up and left (c) points straight up (d) points right
29. 29.🦾 A servo moves from 90° to 120°. How many degrees does it turn?
30. 30.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo program runs:
    angle = 110
    angle = angle + 40
    angle = angle − 20
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
33. 33.🦾 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 straight up (c) points right (d) points up and left
34. 34.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
35. 35.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo moves from 60° to 30°. How many degrees does it turn?
37. 37.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “has just two wires” is true of a DC motor. (a) True (b) False

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