Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 176 · 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 = 180
   angle = angle − 30
   angle = angle + 30
   angle = angle − 60
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
5. 5.🦾 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 left (b) points up and right (c) points right (d) points up and left
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a DC motor (d) a light sensor
8. 8.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
9. 9.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
11. 11.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
12. 12.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
13. 13.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
14. 14.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
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.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
17. 17.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
18. 18.🦾 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 straight up (d) points right
19. 19.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
21. 21.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
22. 22.🦾 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 up and right (d) points straight up
23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
24. 24.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
26. 26.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
27. 27.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
28. 28.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
30. 30.🦾 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 right (b) points up and right (c) points left (d) points straight up
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
32. 32.🦾 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 up and left (b) points right (c) points up and right (d) points straight up
33. 33.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
36. 36.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 30
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
39. 39.🦾 A servo moves from 40° to 130°. How many degrees does it turn?
40. 40.🦾 A servo moves from 100° to 50°. How many degrees does it turn?

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