Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 134 · 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 0° to 20°. How many degrees does it turn?
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo moves from 10° to 140°. How many degrees does it turn?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
9. 9.🦾 A servo program runs:
   angle = 80
   angle = angle − 50
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
11. 11.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
14. 14.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
15. 15.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo moves from 170° to 0°. 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.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
24. 24.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
26. 26.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
29. 29.⚙️ 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
30. 30.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
31. 31.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
33. 33.🦾 A servo program runs:
    angle = 60
    angle = angle + 20
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 110° to 50°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
37. 37.🦾 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 straight up (c) points up and right (d) points right
38. 38.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 80° to 140°. How many degrees does it turn?

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