Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 731 · 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 = 50
   angle = angle − 30
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
2. 2.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
6. 6.🦾 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 right (b) points up and left (c) points right (d) points left
7. 7.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
8. 8.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
9. 9.🦾 A servo program runs:
   angle = 180
   angle = angle − 10
   angle = angle − 20
   angle = angle − 60
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
11. 11.🦾 A servo moves from 100° to 180°. How many degrees does it turn?
12. 12.🦾 A servo moves from 130° to 140°. How many degrees does it turn?
13. 13.🦾 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 right (c) points up and right (d) points straight up
14. 14.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
16. 16.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    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 has a signal wire? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
20. 20.🦾 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 left
21. 21.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 10
    angle = angle − 50
    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 180°?
25. 25.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle + 60
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
29. 29.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
30. 30.🦾 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 left (c) points up and right (d) points straight up
31. 31.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 110
    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 90°?
35. 35.🦾 A servo moves from 180° to 170°. How many degrees does it turn?
36. 36.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
37. 37.⚙️ 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
38. 38.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 60
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?

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