Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 541 · 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 DC motor (b) a servo motor
2. 2.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
4. 4.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
6. 6.🦾 A servo program runs:
   angle = 20
   angle = angle − 10
   angle = angle + 40
   angle = angle − 10
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
8. 8.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
9. 9.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
10. 10.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
12. 12.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
13. 13.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
16. 16.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
17. 17.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo program runs:
    angle = 160
    angle = angle − 60
    angle = angle + 60
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 10
    angle = angle − 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
22. 22.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
23. 23.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
24. 24.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
25. 25.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
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 left (b) points up and right (c) points left (d) points straight up
27. 27.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
28. 28.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
29. 29.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 30
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
33. 33.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
34. 34.🦾 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 left (c) points right (d) points up and left
35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
36. 36.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
37. 37.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo moves from 130° to 120°. How many degrees does it turn?
40. 40.🦾 A servo moves from 10° to 130°. How many degrees does it turn?

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