Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 31 · 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 moves an arm joint? (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 turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
4. 4.🦾 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 straight up (d) points left
5. 5.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
6. 6.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
7. 7.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
8. 8.🦾 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 straight up (c) points right (d) points up and left
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
10. 10.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo program runs:
    angle = 90
    angle = angle + 30
    angle = angle + 30
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle − 20
    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.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
15. 15.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
16. 16.⚙️ 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
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
18. 18.🦾 A servo moves from 0° to 100°. How many degrees does it turn?
19. 19.🦾 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 right (b) points left (c) points straight up (d) points up and right
20. 20.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
21. 21.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 60
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 right (b) points up and left (c) points straight up (d) points left
28. 28.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 40
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 60
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 160
    angle = angle + 10
    angle = angle − 50
    angle = angle − 60
    angle = angle − 60
    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 120°?
35. 35.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo moves from 160° to 180°. How many degrees does it turn?
37. 37.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle − 50
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

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