Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 879 · 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: “has just two wires” is true of a servo motor. (a) True (b) False
2. 2.True or false: “reverses if wires swap” is true of a DC 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 right (b) points left (c) points up and left (d) points straight up
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
5. 5.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
6. 6.🦾 A servo program runs:
   angle = 60
   angle = angle − 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
8. 8.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
10. 10.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle − 20
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
15. 15.🦾 A servo moves from 150° to 90°. How many degrees does it turn?
16. 16.🦾 A servo program runs:
    angle = 90
    angle = angle + 40
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo moves from 170° to 50°. How many degrees does it turn?
18. 18.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
20. 20.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.🦾 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 straight up (c) points right (d) points left
24. 24.🦾 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 left (b) points left (c) points right (d) points up and right
25. 25.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle + 10
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
30. 30.🦾 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 left (b) points left (c) points straight up (d) points up and right
31. 31.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
32. 32.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
37. 37.🦾 A servo moves from 120° to 70°. How many degrees does it turn?
38. 38.🦾 A servo moves from 10° to 80°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False

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