Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 395 · 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 turns to an exact angle? (a) a DC motor (b) a servo motor
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
4. 4.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
7. 7.🦾 A servo moves from 100° to 10°. How many degrees does it turn?
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 spins faster with more V? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
11. 11.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
12. 12.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
13. 13.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
14. 14.🦾 A servo moves from 50° to 40°. How many degrees does it turn?
15. 15.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
16. 16.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
17. 17.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
18. 18.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
19. 19.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo moves from 140° to 0°. How many degrees does it turn?
21. 21.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 30
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
23. 23.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
26. 26.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
27. 27.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
29. 29.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
33. 33.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
34. 34.🦾 A servo moves from 20° to 80°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 20
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 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 up and left (b) points right (c) points up and right (d) points left
37. 37.🦾 A servo moves from 0° to 10°. How many degrees does it turn?
38. 38.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
39. 39.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 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 right (c) points up and right (d) points left

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