Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 870 · 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.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
2. 2.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
3. 3.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
5. 5.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
6. 6.🦾 A servo program runs:
   angle = 20
   angle = angle − 20
   angle = angle + 50
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
9. 9.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
10. 10.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
11. 11.🦾 A servo moves from 120° to 130°. How many degrees does it turn?
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
13. 13.🦾 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 straight up (c) points up and right (d) points left
14. 14.🦾 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 straight up (b) points up and left (c) points left (d) points right
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 60
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
21. 21.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
22. 22.⚙️ 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
23. 23.🦾 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 up and right
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.🦾 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 left (d) points up and left
26. 26.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
28. 28.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
29. 29.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo moves from 160° to 180°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
33. 33.🦾 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 straight up (b) points left (c) points up and right (d) points up and left
34. 34.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
35. 35.🦾 A servo moves from 80° to 70°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 110° to 60°. How many degrees does it turn?
38. 38.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
39. 39.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
40. 40.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor

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