Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 683 · 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 DC motor (b) a servo motor
2. 2.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
4. 4.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
6. 6.🦾 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 straight up (b) points up and left (c) points left (d) points up and right
7. 7.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
8. 8.🦾 A servo program runs:
   angle = 50
   angle = angle − 10
   angle = angle + 30
   angle = angle − 20
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
10. 10.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
11. 11.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
12. 12.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo moves from 150° to 30°. How many degrees does it turn?
14. 14.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
17. 17.⚙️ 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
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 18° (d) 1800°
20. 20.🦾 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 up and right
21. 21.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
22. 22.⚙️ 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
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
25. 25.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 100° to 60°. How many degrees does it turn?
27. 27.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
29. 29.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
30. 30.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
32. 32.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
33. 33.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
35. 35.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
36. 36.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
39. 39.🦾 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 right (d) points up and left
40. 40.🦾 A servo moves from 50° to 40°. How many degrees does it turn?

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