Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 282 · 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.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
2. 2.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
3. 3.🦾 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 right (c) points straight up (d) points right
4. 4.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
5. 5.⚙️ 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
6. 6.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
8. 8.🦾 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
9. 9.🦾 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 left (b) points up and right (c) points right (d) points straight up
10. 10.🦾 A servo moves from 140° to 100°. How many degrees does it turn?
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ 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
14. 14.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
15. 15.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
17. 17.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
18. 18.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
19. 19.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
21. 21.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle + 30
    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 45°. Where does the arm point? (a) points right (b) points left (c) points up and left (d) points up and right
30. 30.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
35. 35.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo program runs:
    angle = 60
    angle = angle + 30
    angle = angle + 10
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
39. 39.🦾 A servo moves from 90° to 100°. How many degrees does it turn?
40. 40.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True

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