Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 223 · 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 has a signal wire? (a) a servo motor (b) a DC motor
2. 2.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
3. 3.🦾 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 left (b) points up and right (c) points straight up (d) points right
4. 4.🦾 A servo program runs:
   angle = 110
   angle = angle + 50
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
6. 6.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
7. 7.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
8. 8.⚙️ 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
9. 9.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
11. 11.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
15. 15.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
16. 16.🦾 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 up and right (b) points straight up (c) points right (d) points up and left
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
19. 19.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
20. 20.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
21. 21.🦾 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
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
26. 26.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 50
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 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 up and left (c) points right (d) points straight up
30. 30.🦾 A servo moves from 60° to 110°. How many degrees does it turn?
31. 31.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
32. 32.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 30
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
35. 35.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
38. 38.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
39. 39.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
40. 40.🦾 A servo moves from 140° to 20°. How many degrees does it turn?

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