Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 891 · 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.🦾 A servo moves from 130° to 110°. How many degrees does it turn?
2. 2.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
3. 3.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
4. 4.🦾 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
5. 5.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo program runs:
   angle = 30
   angle = angle + 20
   angle = angle − 10
   angle = angle + 50
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
8. 8.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
9. 9.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
11. 11.🦾 A servo moves from 170° to 140°. How many degrees does it turn?
12. 12.🦾 A servo program runs:
    angle = 140
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
15. 15.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
19. 19.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
21. 21.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle − 10
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 60° to 50°. How many degrees does it turn?
23. 23.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
24. 24.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
25. 25.🦾 A servo program runs:
    angle = 110
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 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 right (b) points up and left (c) points up and right (d) points left
27. 27.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo moves from 170° to 150°. How many degrees does it turn?
29. 29.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
31. 31.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
32. 32.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo moves from 110° to 50°. How many degrees does it turn?
34. 34.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
35. 35.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
37. 37.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
38. 38.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
40. 40.🦾 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 up and right (b) points right (c) points left (d) points straight up

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