Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 264 · 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: “reverses if wires swap” is true of a servo motor. (a) True (b) False
2. 2.⚙️ 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
3. 3.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
4. 4.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo program runs:
   angle = 110
   angle = angle − 20
   angle = angle + 10
   angle = angle − 30
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
7. 7.🦾 A servo program runs:
   angle = 20
   angle = angle + 50
   angle = angle + 10
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo program runs:
   angle = 140
   angle = angle − 20
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
10. 10.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
13. 13.🦾 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 left (c) points up and left (d) points up and right
14. 14.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
15. 15.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
16. 16.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
18. 18.🦾 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 right (b) points right (c) points left (d) points up and left
19. 19.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
20. 20.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
21. 21.🦾 A servo moves from 100° to 60°. How many degrees does it turn?
22. 22.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 0° to 50°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
25. 25.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
27. 27.🦾 A servo moves from 110° to 20°. How many degrees does it turn?
28. 28.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 180° (d) 1800°
29. 29.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
30. 30.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo moves from 70° to 20°. How many degrees does it turn?
32. 32.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
33. 33.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
34. 34.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
36. 36.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
37. 37.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo moves from 0° to 30°. How many degrees does it turn?
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
40. 40.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor

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