Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 183 · 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 faster with more V? (a) a servo motor (b) a DC motor
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
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 straight up (b) points up and left (c) points right (d) points up and right
4. 4.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
6. 6.🦾 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 up and right (c) points left (d) points straight up
7. 7.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
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 moves from 50° to 130°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
11. 11.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
13. 13.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
15. 15.🦾 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 right (b) points up and left (c) points straight up (d) points right
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
17. 17.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo moves from 30° to 110°. How many degrees does it turn?
19. 19.🦾 A servo moves from 140° to 70°. How many degrees does it turn?
20. 20.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
21. 21.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
24. 24.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle − 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
26. 26.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
27. 27.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
29. 29.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
30. 30.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
32. 32.🦾 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 left (c) points up and right (d) points straight up
33. 33.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo moves from 100° to 70°. How many degrees does it turn?
36. 36.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
37. 37.🦾 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 up and right (b) points straight up (c) points up and left (d) points right
38. 38.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
39. 39.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
40. 40.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True

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