Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 69 · 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 motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
2. 2.🦾 A servo moves from 10° to 180°. How many degrees does it turn?
3. 3.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
5. 5.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
6. 6.🦾 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 right (c) points straight up (d) points up and right
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
8. 8.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
9. 9.🦾 A servo moves from 50° to 90°. How many degrees does it turn?
10. 10.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
14. 14.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
18. 18.⚙️ 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
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 left (b) points up and right (c) points right (d) points straight up
20. 20.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
21. 21.🦾 A servo program runs:
    angle = 50
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 50
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
26. 26.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
27. 27.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo moves from 40° to 50°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo moves from 20° to 120°. How many degrees does it turn?
32. 32.🦾 A servo moves from 70° to 40°. How many degrees does it turn?
33. 33.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
34. 34.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 10
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 50° to 160°. How many degrees does it turn?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?

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