Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 317 · 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 90°. Where does the arm point? (a) points up and right (b) points straight up (c) points right (d) points left
2. 2.🦾 A servo moves from 150° to 10°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
6. 6.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
7. 7.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
9. 9.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
10. 10.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
11. 11.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
13. 13.🦾 A servo program runs:
    angle = 40
    angle = angle + 30
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
15. 15.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
18. 18.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
21. 21.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo moves from 170° to 0°. How many degrees does it turn?
23. 23.🦾 A servo moves from 170° to 10°. How many degrees does it turn?
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
25. 25.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 60
    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 left (b) points right (c) points straight up (d) points up and left
27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
28. 28.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
29. 29.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
31. 31.🦾 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 right (b) points left (c) points up and right (d) points straight up
32. 32.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
35. 35.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
36. 36.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
38. 38.🦾 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 right (b) points up and left (c) points left (d) points straight up
39. 39.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor

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