Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 138 · 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 spins round and round? (a) a servo motor (b) a DC motor
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
3. 3.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
4. 4.🦾 A servo program runs:
   angle = 80
   angle = angle − 20
   angle = angle + 40
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
6. 6.🦾 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 left (b) points up and right (c) points up and left (d) points right
7. 7.🦾 A servo moves from 140° to 70°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
10. 10.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
11. 11.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
12. 12.🦾 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 left (b) points straight up (c) points right (d) points up and right
13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
15. 15.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
16. 16.🦾 A servo program runs:
    angle = 70
    angle = angle + 30
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
19. 19.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
21. 21.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
22. 22.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
23. 23.🦾 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 right (b) points up and left (c) points straight up (d) points left
24. 24.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
25. 25.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
26. 26.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
27. 27.⚙️ 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
28. 28.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
29. 29.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
31. 31.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
32. 32.🦾 A servo moves from 170° to 20°. How many degrees does it turn?
33. 33.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
34. 34.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
35. 35.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
37. 37.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
38. 38.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
39. 39.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
40. 40.True or false: “has just two wires” is true of a servo motor. (a) True (b) False

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