Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 222 · 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 motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
2. 2.🦾 A servo program runs:
   angle = 130
   angle = angle − 10
   angle = angle + 50
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
4. 4.⚙️ 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
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
9. 9.🦾 A servo program runs:
   angle = 0
   angle = angle + 40
   angle = angle + 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
12. 12.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
13. 13.🦾 A servo moves from 170° to 150°. How many degrees does it turn?
14. 14.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
15. 15.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
16. 16.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
18. 18.🦾 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 straight up (b) points left (c) points up and left (d) points up and right
19. 19.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo moves from 100° to 40°. How many degrees does it turn?
21. 21.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
23. 23.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
24. 24.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 40° to 120°. How many degrees does it turn?
27. 27.🦾 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 right (c) points up and left (d) points right
28. 28.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
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: “holds a set angle” is true of a DC motor. (a) True (b) False
32. 32.🦾 A servo moves from 70° to 180°. How many degrees does it turn?
33. 33.🦾 A servo moves from 20° to 120°. How many degrees does it turn?
34. 34.🦾 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 left (b) points up and right (c) points right (d) points straight up
35. 35.🦾 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 straight up (b) points up and right (c) points right (d) points left
36. 36.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
37. 37.🦾 A servo moves from 120° to 30°. How many degrees does it turn?
38. 38.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
40. 40.🦾 A servo program runs:
    angle = 100
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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