Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 510 · 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 turns to an exact angle? (a) a servo motor (b) a DC motor
2. 2.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
3. 3.🦾 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 left (d) points straight up
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
7. 7.🦾 A servo program runs:
   angle = 10
   angle = angle + 20
   angle = angle + 60
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
9. 9.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
12. 12.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo moves from 0° to 110°. How many degrees does it turn?
15. 15.🦾 A servo moves from 120° to 140°. How many degrees does it turn?
16. 16.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
17. 17.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
18. 18.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle + 60
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 120° to 70°. How many degrees does it turn?
20. 20.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
21. 21.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle − 10
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
25. 25.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ 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
28. 28.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle − 20
    angle = angle + 10
    angle = angle + 30
    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 DC motor (b) a servo motor
30. 30.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
31. 31.🦾 A servo moves from 50° to 90°. How many degrees does it turn?
32. 32.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
33. 33.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
34. 34.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 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 straight up (b) points right (c) points left (d) points up and left
37. 37.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
38. 38.🦾 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 up and left (d) points straight up
39. 39.🦾 A servo moves from 110° to 50°. How many degrees does it turn?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?

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