Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 551 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
2. 2.🦾 A servo moves from 70° to 180°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
6. 6.🦾 A servo moves from 40° to 100°. How many degrees does it turn?
7. 7.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
9. 9.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
10. 10.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
11. 11.True or false: “has a signal wire” is true of a DC 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 45°. Where does the arm point? (a) points straight up (b) points up and left (c) points left (d) points up and right
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
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 right (b) points up and left (c) points left (d) points straight up
15. 15.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
16. 16.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
17. 17.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
18. 18.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle − 30
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
20. 20.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
21. 21.🦾 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 left (b) points right (c) points straight up (d) points up and right
22. 22.🦾 A servo moves from 150° to 70°. How many degrees does it turn?
23. 23.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
24. 24.🦾 A servo moves from 40° to 70°. How many degrees does it turn?
25. 25.🦾 A servo moves from 50° to 130°. How many degrees does it turn?
26. 26.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
27. 27.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
29. 29.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
30. 30.🦾 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 straight up (b) points left (c) points up and left (d) points right
31. 31.🦾 A servo moves from 20° to 40°. How many degrees does it turn?
32. 32.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
34. 34.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
35. 35.🦾 A servo moves from 130° to 110°. How many degrees does it turn?
36. 36.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
37. 37.🦾 A servo program runs:
    angle = 130
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
39. 39.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?

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