Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 420 · 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 100° to 40°. How many degrees does it turn?
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
3. 3.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
4. 4.🦾 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 up and right (b) points right (c) points up and left (d) points straight up
5. 5.🦾 A servo moves from 100° to 50°. How many degrees does it turn?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
7. 7.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) water (d) light
8. 8.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
9. 9.🦾 A servo program runs:
   angle = 150
   angle = angle − 10
   angle = angle − 10
   angle = angle + 40
   To what angle (in degrees) does the servo turn in the end?
10. 10.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
11. 11.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
13. 13.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
15. 15.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
16. 16.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
18. 18.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
19. 19.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
21. 21.🦾 A servo program runs:
    angle = 60
    angle = angle − 30
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
23. 23.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
24. 24.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo moves from 60° to 10°. How many degrees does it turn?
26. 26.🦾 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 straight up (b) points up and left (c) points left (d) points right
27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
30. 30.🦾 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 right (d) points up and right
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
33. 33.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
37. 37.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
40. 40.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True

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