Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 66 · 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 DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
3. 3.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
4. 4.🦾 A servo program runs:
   angle = 30
   angle = angle + 10
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
5. 5.🦾 A servo program runs:
   angle = 10
   angle = angle + 40
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo program runs:
   angle = 100
   angle = angle − 40
   angle = angle − 10
   angle = angle + 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
8. 8.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
9. 9.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
12. 12.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
13. 13.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
14. 14.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
16. 16.True or false: “moves an arm joint” 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 180°?
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 right (b) points up and left (c) points straight up (d) points up and right
19. 19.⚙️ 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
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo moves from 30° to 130°. How many degrees does it turn?
22. 22.🦾 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 right (c) points up and left (d) points straight up
23. 23.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 50
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
28. 28.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 40
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo moves from 100° to 180°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
32. 32.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
33. 33.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 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 straight up (d) points left
35. 35.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
36. 36.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle − 40
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
40. 40.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?

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