Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 931 · 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 = 50
   angle = angle − 10
   angle = angle + 50
   angle = angle − 20
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
4. 4.🦾 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 straight up (b) points up and left (c) points up and right (d) points right
5. 5.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
7. 7.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
8. 8.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
9. 9.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
11. 11.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
12. 12.🦾 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 up and right (b) points up and left (c) points left (d) points straight up
13. 13.🦾 A servo program runs:
    angle = 100
    angle = angle + 60
    angle = angle − 60
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
16. 16.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo moves from 50° to 120°. How many degrees does it turn?
18. 18.🦾 A servo moves from 120° to 110°. How many degrees does it turn?
19. 19.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle + 40
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
21. 21.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
22. 22.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
23. 23.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
25. 25.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
26. 26.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
28. 28.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
31. 31.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
33. 33.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
35. 35.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
36. 36.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo moves from 130° to 50°. How many degrees does it turn?
38. 38.🦾 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 up and left (d) points left
39. 39.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?

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