Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 384 · 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 common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
2. 2.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
3. 3.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
4. 4.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
5. 5.🦾 A servo program runs:
   angle = 90
   angle = angle − 60
   angle = angle + 60
   angle = angle + 40
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
7. 7.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
8. 8.🦾 A servo program runs:
   angle = 60
   angle = angle + 30
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
10. 10.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
11. 11.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
12. 12.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
13. 13.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
14. 14.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
16. 16.🦾 A servo moves from 40° to 160°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
22. 22.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
23. 23.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
24. 24.🦾 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 right (c) points straight up (d) points up and left
25. 25.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
27. 27.🦾 A servo moves from 170° to 160°. How many degrees does it turn?
28. 28.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 150° to 170°. How many degrees does it turn?
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 up and left (b) points straight up (c) points right (d) points up and right
31. 31.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo moves from 120° to 170°. How many degrees does it turn?
33. 33.🦾 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 left (b) points straight up (c) points right (d) points up and right
34. 34.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
35. 35.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor
36. 36.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
38. 38.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
39. 39.🦾 A servo program runs:
    angle = 170
    angle = angle − 40
    angle = angle − 40
    angle = angle − 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 180° to 40°. How many degrees does it turn?

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