Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 247 · 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: “drives the wheels” is true of a servo motor. (a) True (b) False
2. 2.🦾 A servo moves from 50° to 160°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
5. 5.🦾 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 up and left (b) points left (c) points right (d) points straight up
6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
8. 8.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
10. 10.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
11. 11.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo moves from 180° to 150°. How many degrees does it turn?
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
15. 15.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo program runs:
    angle = 90
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
20. 20.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
21. 21.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
24. 24.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
25. 25.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
26. 26.🦾 A servo moves from 100° to 80°. How many degrees does it turn?
27. 27.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
29. 29.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
30. 30.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
34. 34.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 140
    angle = angle + 20
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
37. 37.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle − 10
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo moves from 160° to 180°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

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