Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 687 · 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 usually turns 0° to 180°? (a) a servo motor (b) a DC motor
2. 2.🦾 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 right (c) points right (d) points up and left
3. 3.🦾 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
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
5. 5.🦾 A servo moves from 30° to 60°. How many degrees does it turn?
6. 6.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
9. 9.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
11. 11.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
16. 16.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
19. 19.🦾 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
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
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 right (b) points up and right (c) points up and left (d) points left
23. 23.🦾 A servo program runs:
    angle = 50
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
26. 26.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
29. 29.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
34. 34.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 40
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 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 right (b) points up and left (c) points left (d) points straight up
36. 36.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
37. 37.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
40. 40.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False

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