Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 73 · 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.⚙️ 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
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
3. 3.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
4. 4.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
5. 5.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
6. 6.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
7. 7.🦾 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 left (b) points up and right (c) points right (d) points up and left
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
10. 10.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
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 90°. Where does the arm point? (a) points up and left (b) points up and right (c) points right (d) points straight up
13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
14. 14.🦾 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
15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
16. 16.🦾 A servo moves from 130° to 70°. How many degrees does it turn?
17. 17.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
18. 18.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
19. 19.🦾 A servo moves from 170° to 20°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
21. 21.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
27. 27.⚙️ A motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
28. 28.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
29. 29.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
30. 30.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
32. 32.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
34. 34.🦾 A servo moves from 170° to 140°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
37. 37.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
38. 38.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
39. 39.🦾 A servo moves from 130° to 100°. How many degrees does it turn?
40. 40.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False

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