Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 406 · 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 has just two wires? (a) a DC motor (b) a servo motor
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
4. 4.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
5. 5.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
8. 8.🦾 A servo moves from 110° to 10°. How many degrees does it turn?
9. 9.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
10. 10.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
11. 11.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 10
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo program runs:
    angle = 40
    angle = angle + 60
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
15. 15.🦾 A servo moves from 40° to 170°. How many degrees does it turn?
16. 16.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
17. 17.🦾 A servo moves from 170° to 90°. How many degrees does it turn?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo moves from 30° to 120°. How many degrees does it turn?
21. 21.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
23. 23.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 10
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 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 left (b) points right (c) points up and right (d) points up and left
26. 26.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo moves from 90° to 180°. How many degrees does it turn?
28. 28.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
29. 29.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
30. 30.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
31. 31.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 50
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 40
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
35. 35.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
36. 36.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
37. 37.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
38. 38.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
39. 39.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor

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