Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 298 · 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.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
2. 2.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
4. 4.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
5. 5.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
6. 6.🦾 A servo program runs:
   angle = 50
   angle = angle − 40
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
7. 7.🦾 A servo program runs:
   angle = 30
   angle = angle + 60
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
8. 8.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
9. 9.🦾 A servo moves from 160° to 150°. How many degrees does it turn?
10. 10.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
11. 11.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
13. 13.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
14. 14.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
15. 15.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
16. 16.🦾 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 up and left (c) points left (d) points right
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 90° to 80°. How many degrees does it turn?
20. 20.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
21. 21.🦾 A servo moves from 110° to 40°. How many degrees does it turn?
22. 22.🦾 A servo moves from 180° to 160°. How many degrees does it turn?
23. 23.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
24. 24.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
25. 25.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
31. 31.🦾 A servo moves from 80° to 90°. How many degrees does it turn?
32. 32.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 10
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
34. 34.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
35. 35.🦾 A servo moves from 30° to 0°. How many degrees does it turn?
36. 36.🦾 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 up and right (b) points right (c) points up and left (d) points straight up
37. 37.🦾 A servo moves from 170° to 140°. How many degrees does it turn?
38. 38.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
40. 40.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True

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