Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 229 · 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 moves from 160° to 20°. How many degrees does it turn?
2. 2.🦾 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 right (c) points straight up (d) points up and left
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
4. 4.🦾 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 straight up (c) points up and left (d) points right
5. 5.🦾 A servo program runs:
   angle = 170
   angle = angle − 10
   angle = angle − 50
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
6. 6.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
7. 7.🦾 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 up and left (b) points straight up (c) points left (d) points up and right
8. 8.🦾 A servo moves from 110° to 160°. How many degrees does it turn?
9. 9.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
11. 11.🦾 A servo moves from 150° to 80°. How many degrees does it turn?
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
14. 14.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
15. 15.🦾 A servo program runs:
    angle = 50
    angle = angle − 20
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.🦾 A servo program runs:
    angle = 70
    angle = angle − 10
    angle = angle + 20
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
20. 20.🦾 A servo moves from 120° to 50°. How many degrees does it turn?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
22. 22.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
23. 23.⚙️ 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
24. 24.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
26. 26.🦾 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 straight up (b) points up and right (c) points up and left (d) points right
27. 27.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
28. 28.🦾 A servo moves from 10° to 150°. How many degrees does it turn?
29. 29.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle − 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
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 70° to 100°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 140
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
40. 40.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor

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