Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 305 · 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 moves from 0° to 160°. How many degrees does it turn?
2. 2.🦾 A servo moves from 130° to 50°. How many degrees does it turn?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
4. 4.⚙️ 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
5. 5.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
7. 7.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
8. 8.🦾 A servo program runs:
   angle = 130
   angle = angle − 60
   angle = angle + 40
   angle = angle + 40
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
11. 11.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
12. 12.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
13. 13.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
14. 14.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
15. 15.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
16. 16.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
20. 20.⚙️ 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
21. 21.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
22. 22.🦾 A servo program runs:
    angle = 120
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 10° to 120°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
25. 25.🦾 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 right (d) points left
26. 26.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
27. 27.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo moves from 90° to 100°. How many degrees does it turn?
31. 31.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
32. 32.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
33. 33.🦾 A servo moves from 80° to 10°. How many degrees does it turn?
34. 34.🦾 A servo moves from 80° to 180°. How many degrees does it turn?
35. 35.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
37. 37.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
38. 38.🦾 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 right (b) points left (c) points up and right (d) points straight up
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
40. 40.🦾 A servo program runs:
    angle = 160
    angle = angle − 30
    angle = angle − 10
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?

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