Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 451 · 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: “holds a set angle” is true of a servo motor. (a) False (b) True
2. 2.True or false: “spins faster with more V” is true of a DC 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: “has just two wires” is true of a DC motor. (a) True (b) False
5. 5.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
6. 6.🦾 A servo moves from 180° to 70°. How many degrees does it turn?
7. 7.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points straight up (b) points left (c) points up and right (d) points right
8. 8.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
10. 10.🦾 A servo moves from 50° to 90°. How many degrees does it turn?
11. 11.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
18. 18.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
19. 19.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
21. 21.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle + 10
    angle = angle − 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo moves from 100° to 50°. How many degrees does it turn?
25. 25.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
27. 27.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
28. 28.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
29. 29.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle − 10
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
32. 32.🦾 A servo moves from 160° to 80°. How many degrees does it turn?
33. 33.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
34. 34.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
39. 39.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
40. 40.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle + 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?

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