Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 217 · 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 drives the wheels? (a) a servo motor (b) a DC motor
2. 2.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
3. 3.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a DC motor (d) a buzzer
5. 5.🦾 A servo moves from 20° to 30°. How many degrees does it turn?
6. 6.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
7. 7.🦾 A servo moves from 0° to 170°. How many degrees does it turn?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
9. 9.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
10. 10.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle + 40
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 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 left (c) points straight up (d) points up and right
12. 12.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
14. 14.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
15. 15.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
17. 17.🦾 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 right (c) points straight up (d) points up and right
18. 18.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
22. 22.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
23. 23.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
27. 27.🦾 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 right (b) points up and right (c) points straight up (d) points up and left
28. 28.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
29. 29.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
30. 30.🦾 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 left (b) points right (c) points left (d) points up and right
31. 31.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 70° to 40°. How many degrees does it turn?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
37. 37.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle + 10
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 30
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True

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