Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 150 · 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 moves from 90° to 150°. How many degrees does it turn?
2. 2.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo moves from 100° to 90°. How many degrees does it turn?
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
9. 9.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
13. 13.🦾 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 right (b) points straight up (c) points up and right (d) points up and left
14. 14.🦾 A servo moves from 40° to 160°. How many degrees does it turn?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
16. 16.🦾 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 right (c) points up and right (d) points straight up
17. 17.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
18. 18.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
20. 20.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo moves from 10° to 30°. How many degrees does it turn?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
24. 24.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
25. 25.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
26. 26.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
28. 28.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
29. 29.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
30. 30.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo moves from 50° to 160°. How many degrees does it turn?
32. 32.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
35. 35.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
36. 36.🦾 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 left (c) points straight up (d) points right
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
38. 38.⚙️ 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
39. 39.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “spins round and round” is true of a servo motor. (a) True (b) False

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