Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 178 · 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: “has just two wires” is true of a DC motor. (a) True (b) False
2. 2.⚙️ 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
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
4. 4.🦾 A servo moves from 130° to 70°. How many degrees does it turn?
5. 5.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
6. 6.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
7. 7.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
8. 8.🦾 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 right (c) points up and right (d) points straight up
9. 9.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
10. 10.⚙️ 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
11. 11.🦾 A servo moves from 150° to 20°. How many degrees does it turn?
12. 12.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo moves from 180° to 110°. How many degrees does it turn?
15. 15.🦾 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 left (c) points up and right (d) points up and left
16. 16.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
20. 20.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
21. 21.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
22. 22.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
23. 23.🦾 A servo program runs:
    angle = 110
    angle = angle − 20
    angle = angle − 50
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
25. 25.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
26. 26.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
27. 27.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
28. 28.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo moves from 110° to 60°. How many degrees does it turn?
30. 30.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
31. 31.🦾 A servo moves from 10° to 160°. How many degrees does it turn?
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
33. 33.🦾 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 up and right (c) points up and left (d) points right
34. 34.🦾 A servo moves from 60° to 110°. How many degrees does it turn?
35. 35.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
38. 38.🦾 A servo moves from 60° to 130°. How many degrees does it turn?
39. 39.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?

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