Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 46 · 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: “holds a set angle” is true of a DC motor. (a) True (b) False
2. 2.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
4. 4.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
6. 6.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
9. 9.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
10. 10.🦾 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 right (b) points straight up (c) points left (d) points up and left
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
12. 12.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
13. 13.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
14. 14.🦾 A servo moves from 10° to 120°. How many degrees does it turn?
15. 15.🦾 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 straight up (c) points right (d) points up and left
16. 16.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 50
    angle = angle − 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
19. 19.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
21. 21.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
22. 22.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
24. 24.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
25. 25.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
27. 27.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
28. 28.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
29. 29.🦾 A servo moves from 160° to 110°. How many degrees does it turn?
30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
31. 31.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
32. 32.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 50
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 0° to 10°. How many degrees does it turn?
35. 35.🦾 A servo moves from 40° to 130°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 60° to 70°. How many degrees does it turn?
38. 38.🦾 A servo moves from 130° to 150°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?

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