Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 726 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
2. 2.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
3. 3.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
4. 4.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
6. 6.🦾 A servo program runs:
   angle = 50
   angle = angle + 60
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
8. 8.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
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: “drives the wheels” is true of a DC motor. (a) False (b) True
11. 11.🦾 A servo moves from 180° to 150°. How many degrees does it turn?
12. 12.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
13. 13.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
17. 17.🦾 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 left (c) points up and right (d) points left
18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo program runs:
    angle = 140
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
22. 22.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
23. 23.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
24. 24.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
25. 25.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
26. 26.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
27. 27.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 10
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 170° to 0°. How many degrees does it turn?
29. 29.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
30. 30.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
31. 31.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
33. 33.🦾 A servo moves from 10° to 170°. How many degrees does it turn?
34. 34.🦾 A servo program runs:
    angle = 60
    angle = angle + 20
    angle = angle + 50
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 40° to 60°. How many degrees does it turn?
36. 36.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo moves from 90° to 0°. How many degrees does it turn?
38. 38.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
39. 39.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo moves from 180° to 50°. How many degrees does it turn?

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