Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 608 · 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 program runs:
   angle = 120
   angle = angle + 30
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
3. 3.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
5. 5.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
7. 7.🦾 A servo program runs:
   angle = 10
   angle = angle + 60
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
13. 13.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
14. 14.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 40
    angle = angle − 30
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 10
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
18. 18.🦾 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 up and right (d) points left
19. 19.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
20. 20.⚙️ 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
21. 21.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 30
    angle = angle + 10
    angle = angle + 20
    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 60°?
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle − 20
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 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 right (c) points left (d) points up and left
29. 29.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo moves from 150° to 110°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 60
    angle = angle − 30
    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.🦾 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 right (c) points up and right (d) points left
36. 36.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
38. 38.🦾 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 up and right (c) points up and left (d) points left
39. 39.🦾 A servo moves from 40° to 90°. How many degrees does it turn?
40. 40.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True

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