Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 296 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
2. 2.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
3. 3.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
6. 6.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
7. 7.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
8. 8.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo program runs:
   angle = 110
   angle = angle + 10
   angle = angle − 60
   angle = angle − 50
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 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 right (b) points straight up (c) points up and left (d) points left
11. 11.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
12. 12.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
13. 13.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle − 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 140° to 60°. How many degrees does it turn?
15. 15.🦾 A servo program runs:
    angle = 140
    angle = angle − 30
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
17. 17.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
18. 18.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
19. 19.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
20. 20.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
21. 21.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
23. 23.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
25. 25.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
26. 26.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo moves from 20° to 30°. How many degrees does it turn?
29. 29.🦾 A servo moves from 130° to 80°. How many degrees does it turn?
30. 30.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
31. 31.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
34. 34.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo program runs:
    angle = 80
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 A servo moves from 110° to 150°. How many degrees does it turn?
39. 39.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
40. 40.🦾 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 up and right (c) points right (d) points up and left

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