Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 978 · 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 turns to an exact angle? (a) a servo motor (b) a DC motor
2. 2.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
3. 3.🦾 A servo moves from 50° to 70°. How many degrees does it turn?
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
5. 5.🦾 A servo program runs:
   angle = 140
   angle = angle − 30
   angle = angle − 30
   angle = angle − 10
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo program runs:
   angle = 140
   angle = angle − 10
   angle = angle + 10
   angle = angle − 30
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo moves from 110° to 160°. How many degrees does it turn?
10. 10.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
13. 13.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
18. 18.🦾 A servo moves from 40° to 130°. 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 90°. Where does the arm point? (a) points left (b) points right (c) points straight up (d) points up and left
20. 20.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
21. 21.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo moves from 80° to 130°. How many degrees does it turn?
23. 23.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
25. 25.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo program runs:
    angle = 110
    angle = angle + 40
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 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 up and right (b) points straight up (c) points up and left (d) points left
30. 30.🦾 A servo moves from 170° to 90°. How many degrees does it turn?
31. 31.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
32. 32.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
34. 34.🦾 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 left (d) points straight up
35. 35.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
36. 36.🦾 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 left (c) points up and right (d) points right
37. 37.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
39. 39.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?

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