Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 77 · 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) add more wheels (b) shake it (c) paint it red (d) swap its two wires
2. 2.🦾 A servo moves from 130° to 140°. How many degrees does it turn?
3. 3.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
5. 5.🦾 A servo program runs:
   angle = 110
   angle = angle − 50
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo program runs:
   angle = 60
   angle = angle + 30
   angle = angle − 10
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
10. 10.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
11. 11.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
12. 12.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
13. 13.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
14. 14.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
16. 16.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
17. 17.🦾 A servo moves from 150° to 50°. How many degrees does it turn?
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 up and right (b) points up and left (c) points straight up (d) points left
19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ 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
21. 21.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
22. 22.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
23. 23.🦾 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 up and left (c) points right (d) points up and right
24. 24.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
25. 25.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo moves from 110° to 180°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 50
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
30. 30.🦾 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 left (c) points left (d) points up and right
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
33. 33.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 50
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
35. 35.🦾 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 up and left (b) points left (c) points up and right (d) points right
36. 36.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
39. 39.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
40. 40.🦾 A servo moves from 160° to 90°. How many degrees does it turn?

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