Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 76 · 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: “turns to an exact angle” is true of a servo motor. (a) False (b) True
2. 2.🦾 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 right (d) points up and left
3. 3.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a fan (d) a DC motor
5. 5.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
6. 6.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
7. 7.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
8. 8.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
11. 11.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
13. 13.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
14. 14.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
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 right (c) points up and left (d) points left
16. 16.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) paint it red (d) add more wheels
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
18. 18.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
20. 20.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo moves from 130° to 140°. How many degrees does it turn?
22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
24. 24.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
25. 25.🦾 A servo moves from 120° to 50°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 120
    angle = angle + 50
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
30. 30.🦾 A servo moves from 120° to 10°. How many degrees does it turn?
31. 31.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
34. 34.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
36. 36.🦾 A servo moves from 30° to 50°. How many degrees does it turn?
37. 37.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?

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