Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 698 · 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 servo motor (b) a DC motor
2. 2.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
5. 5.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
6. 6.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
7. 7.🦾 A servo program runs:
   angle = 130
   angle = angle − 10
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
9. 9.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
11. 11.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle − 50
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
13. 13.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
14. 14.🦾 A servo program runs:
    angle = 90
    angle = angle − 10
    angle = angle + 40
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
16. 16.🦾 A servo moves from 10° to 30°. How many degrees does it turn?
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
18. 18.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle + 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 100° to 80°. How many degrees does it turn?
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 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 left (b) points up and right (c) points straight up (d) points up and left
22. 22.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
23. 23.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
24. 24.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
25. 25.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
26. 26.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
27. 27.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo moves from 150° to 20°. How many degrees does it turn?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
30. 30.⚙️ 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
31. 31.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
33. 33.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
34. 34.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
35. 35.🦾 A servo moves from 60° to 10°. How many degrees does it turn?
36. 36.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
37. 37.🦾 A servo moves from 120° to 100°. How many degrees does it turn?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
39. 39.🦾 A servo moves from 170° to 50°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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