Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 41 · 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 DC motor (b) a servo motor
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
3. 3.🦾 A servo moves from 180° to 90°. How many degrees does it turn?
4. 4.🦾 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 right (c) points straight up (d) points up and left
5. 5.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
6. 6.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
7. 7.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
8. 8.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
9. 9.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
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 up and left (b) points left (c) points up and right (d) points right
12. 12.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
14. 14.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
15. 15.🦾 A servo moves from 20° to 140°. How many degrees does it turn?
16. 16.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
17. 17.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
18. 18.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ 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
21. 21.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
22. 22.🦾 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
23. 23.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
24. 24.🦾 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 left (b) points right (c) points up and right (d) points straight up
25. 25.🦾 A servo program runs:
    angle = 110
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
29. 29.🦾 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 straight up (b) points up and left (c) points left (d) points up and right
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
31. 31.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
32. 32.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
33. 33.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 180° (d) 18°
35. 35.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
36. 36.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
37. 37.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?

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