Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 989 · 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.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
3. 3.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
4. 4.🦾 A servo program runs:
   angle = 100
   angle = angle + 60
   angle = angle + 20
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
6. 6.🦾 A servo moves from 150° to 20°. How many degrees does it turn?
7. 7.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) swap its two wires (d) shake it
8. 8.🦾 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 up and right (c) points straight up (d) points left
9. 9.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
10. 10.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
11. 11.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo program runs:
    angle = 160
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 A servo moves from 70° to 20°. How many degrees does it turn?
14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
15. 15.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
16. 16.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo moves from 120° to 30°. How many degrees does it turn?
18. 18.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
20. 20.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 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 up and right (c) points up and left (d) points straight up
23. 23.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
29. 29.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
30. 30.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
34. 34.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
35. 35.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
36. 36.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 110
    angle = angle + 40
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 10° to 60°. How many degrees does it turn?
39. 39.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
40. 40.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True

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