Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 938 · 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: “spins faster with more V” is true of a DC motor. (a) True (b) False
2. 2.🦾 A servo program runs:
   angle = 50
   angle = angle − 20
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
3. 3.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
4. 4.🦾 A servo program runs:
   angle = 50
   angle = angle − 20
   angle = angle − 20
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
5. 5.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
6. 6.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
7. 7.🦾 A servo moves from 70° to 10°. How many degrees does it turn?
8. 8.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
10. 10.🦾 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 up and right (c) points up and left (d) points right
11. 11.🦾 A servo moves from 90° to 50°. How many degrees does it turn?
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
14. 14.🦾 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 right (b) points straight up (c) points up and right (d) points up and left
15. 15.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
16. 16.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
19. 19.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
20. 20.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
22. 22.🦾 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 up and right (b) points left (c) points right (d) points up and left
23. 23.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
24. 24.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
26. 26.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
27. 27.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ 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
29. 29.🦾 A servo moves from 10° to 100°. How many degrees does it turn?
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
31. 31.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo moves from 50° to 180°. How many degrees does it turn?
33. 33.⚙️ 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
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
35. 35.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
37. 37.🦾 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 right (b) points left (c) points up and right (d) points straight up
38. 38.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
39. 39.🦾 A servo moves from 100° to 10°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 80
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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