Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 763 · 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.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
2. 2.🦾 A servo program runs:
   angle = 60
   angle = angle − 40
   angle = angle + 40
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
3. 3.🦾 A servo program runs:
   angle = 20
   angle = angle + 30
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
4. 4.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo program runs:
   angle = 50
   angle = angle + 60
   angle = angle − 30
   angle = angle − 30
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo moves from 70° to 60°. How many degrees does it turn?
13. 13.🦾 A servo moves from 70° to 140°. How many degrees does it turn?
14. 14.⚙️ 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
15. 15.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
16. 16.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
19. 19.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
20. 20.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
21. 21.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
23. 23.⚙️ 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
24. 24.🦾 A servo program runs:
    angle = 60
    angle = angle − 20
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
26. 26.🦾 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 straight up (b) points up and left (c) points left (d) points up and right
27. 27.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo moves from 180° to 70°. How many degrees does it turn?
29. 29.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
30. 30.🦾 A servo moves from 90° to 80°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
32. 32.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
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 straight up (b) points up and left (c) points left (d) points right
34. 34.🦾 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 right (b) points up and left (c) points left (d) points up and right
35. 35.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
37. 37.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 60
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo moves from 160° to 150°. How many degrees does it turn?

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