Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 399 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
2. 2.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
3. 3.🦾 A servo program runs:
   angle = 150
   angle = angle + 10
   angle = angle − 60
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
4. 4.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
6. 6.⚙️ 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
7. 7.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
8. 8.🦾 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 right (c) points up and left (d) points left
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo moves from 130° to 170°. How many degrees does it turn?
11. 11.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 40
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
13. 13.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
14. 14.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
15. 15.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
16. 16.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
17. 17.🦾 A servo moves from 120° to 30°. How many degrees does it turn?
18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
19. 19.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 30
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
22. 22.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
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 left (b) points up and right (c) points straight up (d) points right
24. 24.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
25. 25.🦾 A servo moves from 80° to 160°. How many degrees does it turn?
26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
28. 28.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
29. 29.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
32. 32.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
33. 33.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
34. 34.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
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 right (c) points up and left (d) points left
36. 36.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
37. 37.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True

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