Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 18 · 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 reverses if wires swap? (a) a DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
5. 5.⚙️ A motor changes electrical energy into … (a) water (b) light (c) movement (d) sound only
6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
7. 7.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
8. 8.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
9. 9.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
11. 11.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
13. 13.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
15. 15.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
16. 16.🦾 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 right (b) points up and right (c) points straight up (d) points left
17. 17.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 60
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo program runs:
    angle = 60
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 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 left (b) points straight up (c) points up and left (d) points right
21. 21.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo moves from 120° to 30°. How many degrees does it turn?
25. 25.🦾 A servo program runs:
    angle = 100
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle + 40
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
29. 29.🦾 A servo program runs:
    angle = 100
    angle = angle − 20
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo moves from 70° to 120°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
32. 32.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
33. 33.🦾 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 left (b) points right (c) points up and left (d) points straight up
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
35. 35.🦾 A servo program runs:
    angle = 0
    angle = angle + 50
    angle = angle − 30
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
37. 37.🦾 A servo moves from 170° to 110°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle + 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
40. 40.🦾 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 left (b) points right (c) points up and right (d) points straight up

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