Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 325 · 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: “holds a set angle” is true of a DC motor. (a) False (b) True
2. 2.🦾 A servo moves from 100° to 60°. How many degrees does it turn?
3. 3.🦾 A servo moves from 20° to 70°. How many degrees does it turn?
4. 4.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
5. 5.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
7. 7.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
8. 8.⚙️ 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
9. 9.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one moves an arm joint? (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.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
16. 16.🦾 A servo moves from 170° to 70°. How many degrees does it turn?
17. 17.🦾 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 straight up (c) points up and right (d) points right
18. 18.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
19. 19.🦾 A servo moves from 0° to 160°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
21. 21.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
22. 22.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
23. 23.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
24. 24.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
25. 25.⚙️ 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
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 up and left (b) points straight up (c) points right (d) points up and right
27. 27.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
28. 28.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
29. 29.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
30. 30.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
31. 31.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
32. 32.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo program runs:
    angle = 150
    angle = angle − 30
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 30
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
36. 36.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
37. 37.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo moves from 110° to 0°. How many degrees does it turn?
39. 39.🦾 A servo moves from 70° to 30°. How many degrees does it turn?
40. 40.🦾 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 straight up (c) points up and right (d) points right

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