Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 816 · 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.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
2. 2.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
3. 3.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
7. 7.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.🦾 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 right (c) points up and right (d) points straight up
10. 10.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
11. 11.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
13. 13.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
14. 14.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle − 40
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
16. 16.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
17. 17.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 20
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo moves from 80° to 20°. How many degrees does it turn?
19. 19.🦾 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 up and left (d) points right
20. 20.🦾 A servo moves from 110° to 130°. How many degrees does it turn?
21. 21.🦾 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 up and left (d) points straight up
22. 22.🦾 A servo moves from 140° to 120°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
24. 24.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
26. 26.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
29. 29.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
30. 30.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
31. 31.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
32. 32.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo moves from 150° to 50°. How many degrees does it turn?
34. 34.🦾 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 straight up (d) points left
35. 35.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
40. 40.🦾 A servo moves from 70° to 110°. How many degrees does it turn?

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