Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 200 · 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 spins faster with more V? (a) a DC motor (b) a servo motor
2. 2.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
4. 4.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
5. 5.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
6. 6.🦾 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 straight up (d) points up and left
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
9. 9.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
10. 10.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
11. 11.🦾 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 up and left (c) points right (d) points up and right
12. 12.🦾 A servo moves from 60° to 80°. How many degrees does it turn?
13. 13.🦾 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 up and left (b) points up and right (c) points straight up (d) points right
14. 14.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
15. 15.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
16. 16.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
18. 18.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
19. 19.🦾 A servo moves from 150° to 100°. How many degrees does it turn?
20. 20.🦾 A servo moves from 40° to 50°. How many degrees does it turn?
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
22. 22.🦾 A servo program runs:
    angle = 160
    angle = angle + 20
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
24. 24.🦾 A servo program runs:
    angle = 120
    angle = angle − 60
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.🦾 A servo moves from 150° to 170°. How many degrees does it turn?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
27. 27.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
29. 29.🦾 A servo moves from 20° to 140°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle + 30
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
32. 32.🦾 A servo moves from 170° to 100°. How many degrees does it turn?
33. 33.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
34. 34.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
35. 35.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
38. 38.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
39. 39.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False

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