Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 15 · 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 30°?
2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
3. 3.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
4. 4.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
5. 5.🦾 A servo moves from 90° to 120°. How many degrees does it turn?
6. 6.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
7. 7.🦾 A servo moves from 20° to 180°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
10. 10.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
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 program runs:
    angle = 50
    angle = angle + 10
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
15. 15.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
16. 16.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
17. 17.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
18. 18.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
20. 20.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
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 straight up (b) points up and right (c) points right (d) points left
23. 23.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
25. 25.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 110° to 120°. How many degrees does it turn?
27. 27.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
29. 29.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo moves from 30° to 70°. How many degrees does it turn?
31. 31.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
32. 32.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
33. 33.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
34. 34.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle + 10
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 80° to 0°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 20
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 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 left (c) points right (d) points up and left
38. 38.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo program runs:
    angle = 60
    angle = angle + 50
    angle = angle − 50
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?

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