Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 746 · 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 = 120
   angle = angle + 20
   angle = angle − 20
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
3. 3.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
5. 5.🦾 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 up and right (d) points left
6. 6.🦾 A servo moves from 70° to 90°. How many degrees does it turn?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo program runs:
   angle = 130
   angle = angle + 20
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
10. 10.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
11. 11.🦾 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 straight up (b) points up and right (c) points up and left (d) points right
12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
14. 14.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
15. 15.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
17. 17.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
18. 18.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
21. 21.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo moves from 170° to 50°. How many degrees does it turn?
24. 24.🦾 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 right (c) points straight up (d) points up and left
25. 25.⚙️ 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
26. 26.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
27. 27.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
29. 29.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
31. 31.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
33. 33.🦾 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 left (c) points right (d) points straight up
34. 34.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
35. 35.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
36. 36.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
37. 37.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo moves from 130° to 150°. How many degrees does it turn?
39. 39.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
40. 40.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False

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