Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 372 · 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.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
2. 2.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
3. 3.🦾 A servo moves from 140° to 0°. How many degrees does it turn?
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo moves from 80° to 170°. How many degrees does it turn?
6. 6.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
7. 7.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
8. 8.🦾 A servo moves from 40° to 160°. How many degrees does it turn?
9. 9.🦾 A servo program runs:
   angle = 0
   angle = angle + 50
   angle = angle + 20
   angle = angle + 60
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
11. 11.🦾 A servo moves from 160° to 180°. How many degrees does it turn?
12. 12.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
14. 14.⚙️ 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
15. 15.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
17. 17.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
18. 18.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
20. 20.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 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 left (c) points right (d) points up and right
22. 22.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
24. 24.🦾 A servo program runs:
    angle = 70
    angle = angle − 60
    angle = angle + 50
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo program runs:
    angle = 160
    angle = angle − 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo program runs:
    angle = 50
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
29. 29.🦾 A servo moves from 50° to 170°. How many degrees does it turn?
30. 30.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
31. 31.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
32. 32.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo moves from 0° to 130°. How many degrees does it turn?
34. 34.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
35. 35.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) movement (d) water
36. 36.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
37. 37.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
38. 38.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
39. 39.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
40. 40.True or false: “spins round and round” is true of a DC motor. (a) False (b) True

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