Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 346 · 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 program runs:
   angle = 10
   angle = angle + 60
   angle = angle − 40
   angle = angle + 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
3. 3.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
4. 4.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
5. 5.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
7. 7.⚙️ 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
8. 8.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
9. 9.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
10. 10.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
13. 13.🦾 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 straight up (b) points up and right (c) points up and left (d) points left
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
16. 16.🦾 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 up and right (b) points right (c) points left (d) points straight up
17. 17.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
18. 18.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 20
    angle = angle − 30
    angle = angle + 60
    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 160° to 0°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 20
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
23. 23.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
24. 24.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
25. 25.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
26. 26.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
27. 27.🦾 A servo moves from 110° to 20°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle − 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo moves from 100° to 180°. How many degrees does it turn?
31. 31.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
32. 32.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
34. 34.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
35. 35.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
36. 36.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
37. 37.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
38. 38.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
39. 39.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
40. 40.True or false: “spins round and round” is true of a servo motor. (a) True (b) False

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