Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 648 · 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.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
5. 5.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
6. 6.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo program runs:
   angle = 150
   angle = angle + 10
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ 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
9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
10. 10.🦾 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 straight up (b) points right (c) points left (d) points up and right
11. 11.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 40
    angle = angle + 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
14. 14.🦾 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 up and left (c) points left (d) points straight up
15. 15.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
16. 16.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
17. 17.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
18. 18.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
19. 19.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle + 10
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
22. 22.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
23. 23.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
25. 25.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
27. 27.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
28. 28.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
29. 29.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
30. 30.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
31. 31.🦾 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 straight up (b) points up and right (c) points up and left (d) points right
32. 32.🦾 A servo program runs:
    angle = 140
    angle = angle + 30
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
34. 34.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 40
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
36. 36.🦾 A servo program runs:
    angle = 130
    angle = angle − 20
    angle = angle + 10
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 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
38. 38.🦾 A servo moves from 130° to 80°. How many degrees does it turn?
39. 39.🦾 A servo moves from 70° to 160°. How many degrees does it turn?
40. 40.🦾 A servo moves from 120° to 180°. How many degrees does it turn?

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