Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 124 · 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 program runs:
   angle = 90
   angle = angle + 60
   angle = angle + 20
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
3. 3.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
4. 4.🦾 A servo program runs:
   angle = 170
   angle = angle − 30
   angle = angle − 60
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
5. 5.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
6. 6.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
7. 7.🦾 A servo moves from 110° to 150°. How many degrees does it turn?
8. 8.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
9. 9.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
10. 10.🦾 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 right (b) points straight up (c) points left (d) points up and right
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo moves from 100° to 60°. How many degrees does it turn?
13. 13.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
14. 14.🦾 A servo moves from 70° to 60°. How many degrees does it turn?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
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 up and left (b) points right (c) points up and right (d) points left
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
18. 18.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 20
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 0
    angle = angle + 20
    angle = angle + 30
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
22. 22.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
23. 23.🦾 A servo moves from 0° to 100°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
26. 26.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
27. 27.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
28. 28.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
30. 30.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
31. 31.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo moves from 80° to 20°. How many degrees does it turn?
33. 33.🦾 A servo moves from 60° to 20°. How many degrees does it turn?
34. 34.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
35. 35.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 20
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo moves from 30° to 40°. How many degrees does it turn?
37. 37.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
39. 39.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo moves from 110° to 20°. How many degrees does it turn?

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