Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 807 · 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.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
2. 2.🦾 A servo program runs:
   angle = 10
   angle = angle − 10
   angle = angle + 40
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
8. 8.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
9. 9.🦾 A servo moves from 70° to 60°. How many degrees does it turn?
10. 10.🦾 A servo moves from 160° to 10°. How many degrees does it turn?
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
12. 12.🦾 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 straight up (c) points left (d) points up and left
13. 13.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
14. 14.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
15. 15.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
16. 16.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
18. 18.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
19. 19.🦾 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 left (c) points straight up (d) points up and left
20. 20.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
21. 21.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
23. 23.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
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 up and right (b) points left (c) points straight up (d) points right
25. 25.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
27. 27.🦾 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 straight up (c) points right (d) points left
28. 28.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
29. 29.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
30. 30.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo moves from 0° to 180°. How many degrees does it turn?
33. 33.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
34. 34.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
36. 36.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo moves from 40° to 100°. How many degrees does it turn?
38. 38.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
39. 39.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
40. 40.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False

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