Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 718 · 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 DC motor. (a) True (b) False
2. 2.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
3. 3.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
5. 5.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a DC motor (d) a servo motor
7. 7.True or false: “has just two wires” is true of a servo 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 135°. Where does the arm point? (a) points right (b) points up and left (c) points up and right (d) points left
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
15. 15.🦾 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 up and right (c) points straight up (d) points left
16. 16.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
17. 17.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
18. 18.🦾 A servo program runs:
    angle = 60
    angle = angle + 20
    angle = angle − 30
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 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 left (c) points up and right (d) points straight up
20. 20.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo moves from 90° to 100°. How many degrees does it turn?
22. 22.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
23. 23.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
25. 25.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 right (c) points up and right (d) points left
28. 28.🦾 A servo moves from 130° to 160°. How many degrees does it turn?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
30. 30.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
34. 34.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
35. 35.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
37. 37.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 90
    angle = angle − 40
    angle = angle − 40
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False

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