Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 347 · 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 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 right (c) points up and left (d) points straight up
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
3. 3.🦾 A servo moves from 0° to 160°. How many degrees does it turn?
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
5. 5.🦾 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 up and left (b) points straight up (c) points up and right (d) points right
6. 6.🦾 A servo program runs:
   angle = 40
   angle = angle − 10
   angle = angle + 30
   angle = angle − 40
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
8. 8.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo moves from 50° to 120°. How many degrees does it turn?
14. 14.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
15. 15.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
17. 17.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
19. 19.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle + 60
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
23. 23.🦾 A servo program runs:
    angle = 70
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
25. 25.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
26. 26.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
27. 27.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo moves from 40° to 120°. How many degrees does it turn?
29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
30. 30.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo moves from 110° to 160°. How many degrees does it turn?
32. 32.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
33. 33.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
35. 35.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo moves from 80° to 20°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 60
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?

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