Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 172 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
2. 2.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
3. 3.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
4. 4.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
6. 6.🦾 A servo program runs:
   angle = 120
   angle = angle − 50
   angle = angle + 50
   angle = angle − 50
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.⚙️ 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
8. 8.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
9. 9.🦾 A servo moves from 80° to 30°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
11. 11.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo moves from 40° to 70°. How many degrees does it turn?
14. 14.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
15. 15.🦾 A servo program runs:
    angle = 70
    angle = angle + 20
    angle = angle − 40
    angle = angle − 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
17. 17.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
19. 19.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
21. 21.🦾 A servo moves from 50° to 80°. How many degrees does it turn?
22. 22.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo program runs:
    angle = 20
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 120
    angle = angle + 30
    angle = angle + 20
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo program runs:
    angle = 110
    angle = angle + 60
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 up and right (b) points right (c) points left (d) points straight up
28. 28.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
29. 29.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle − 20
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
31. 31.🦾 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 left (d) points up and right
32. 32.🦾 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 up and right (b) points right (c) points straight up (d) points left
33. 33.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
34. 34.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle + 50
    angle = angle + 30
    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.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.🦾 A servo program runs:
    angle = 110
    angle = angle + 30
    angle = angle − 20
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?

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