Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 144 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo moves from 10° to 170°. How many degrees does it turn?
4. 4.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
5. 5.🦾 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 right (d) points left
6. 6.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
9. 9.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
13. 13.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle + 50
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
17. 17.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
18. 18.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
19. 19.🦾 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 left (b) points right (c) points up and right (d) points left
20. 20.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
21. 21.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
22. 22.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
23. 23.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
24. 24.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo moves from 150° to 110°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle − 10
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
35. 35.🦾 A servo moves from 130° to 110°. How many degrees does it turn?
36. 36.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
37. 37.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
38. 38.🦾 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 straight up (c) points right (d) points up and left
39. 39.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?

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