Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 472 · 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 = 160
   angle = angle − 40
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
2. 2.🦾 A servo program runs:
   angle = 180
   angle = angle − 20
   angle = angle − 50
   angle = angle + 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
3. 3.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
4. 4.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
7. 7.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
9. 9.🦾 A servo program runs:
   angle = 130
   angle = angle + 50
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
12. 12.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
13. 13.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
15. 15.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
16. 16.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
17. 17.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
20. 20.True or false: “usually turns 0° to 180°” is true of a DC 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 program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo moves from 20° to 120°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 40
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
30. 30.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
31. 31.🦾 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 right (c) points straight up (d) points up and left
32. 32.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
33. 33.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
34. 34.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle + 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 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 left (b) points up and right (c) points up and left (d) points straight up
36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
37. 37.🦾 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 right (c) points up and left (d) points up and right
38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
40. 40.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True

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