Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 701 · 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 = 10
   angle = angle + 60
   angle = angle + 30
   angle = angle + 30
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
2. 2.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
3. 3.🦾 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 straight up (b) points up and left (c) points left (d) points right
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
5. 5.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
6. 6.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
7. 7.🦾 A servo moves from 170° to 180°. How many degrees does it turn?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
9. 9.🦾 A servo program runs:
   angle = 60
   angle = angle + 10
   angle = angle + 30
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
11. 11.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
12. 12.⚙️ 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
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 up and left (b) points straight up (c) points up and right (d) points left
14. 14.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle + 10
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
16. 16.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
18. 18.🦾 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 left (d) points straight up
19. 19.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 60
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo moves from 100° to 20°. How many degrees does it turn?
24. 24.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
26. 26.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo moves from 80° to 160°. How many degrees does it turn?
28. 28.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
29. 29.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
30. 30.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo program runs:
    angle = 80
    angle = angle − 20
    angle = angle − 20
    angle = angle − 20
    angle = angle + 50
    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.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
35. 35.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
36. 36.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo moves from 100° to 0°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 60
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?

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