Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 717 · 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.⚙️ 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
2. 2.🦾 A servo moves from 60° to 140°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
6. 6.🦾 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 up and left (c) points right (d) points left
7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
9. 9.🦾 A servo program runs:
   angle = 20
   angle = angle + 60
   angle = angle − 20
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
11. 11.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle − 10
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
18. 18.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo moves from 40° to 70°. How many degrees does it turn?
20. 20.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
22. 22.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
23. 23.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
26. 26.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle + 10
    angle = angle − 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 up and left (d) points up and right
28. 28.🦾 A servo moves from 30° to 140°. How many degrees does it turn?
29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
30. 30.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
32. 32.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
33. 33.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
34. 34.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
35. 35.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
36. 36.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
38. 38.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo moves from 100° to 0°. How many degrees does it turn?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?

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