Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 495 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
2. 2.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
3. 3.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
4. 4.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
5. 5.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
6. 6.🦾 A servo program runs:
   angle = 60
   angle = angle − 60
   angle = angle + 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
8. 8.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
9. 9.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
11. 11.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
12. 12.🦾 A servo moves from 160° to 170°. How many degrees does it turn?
13. 13.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
14. 14.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
15. 15.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
17. 17.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo moves from 140° to 150°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
21. 21.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
26. 26.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 30
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 100° to 180°. How many degrees does it turn?
29. 29.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
30. 30.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
31. 31.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
32. 32.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
33. 33.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
34. 34.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
35. 35.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 80
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 30° to 170°. How many degrees does it turn?

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