Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 231 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
2. 2.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo moves from 170° to 30°. How many degrees does it turn?
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
6. 6.🦾 A servo program runs:
   angle = 10
   angle = angle + 20
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
8. 8.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
9. 9.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
10. 10.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
14. 14.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle − 50
    angle = angle + 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
16. 16.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
17. 17.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 10
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
26. 26.🦾 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 up and left (c) points straight up (d) points right
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
28. 28.🦾 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 straight up (b) points left (c) points up and left (d) points right
29. 29.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 20
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo moves from 160° to 150°. How many degrees does it turn?
32. 32.🦾 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 left (d) points up and right
33. 33.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
35. 35.🦾 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 straight up (b) points left (c) points up and left (d) points up and right
36. 36.⚙️ 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
37. 37.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
38. 38.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
39. 39.🦾 A servo moves from 30° to 70°. How many degrees does it turn?
40. 40.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False

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