Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 772 · 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.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
4. 4.🦾 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 right (b) points up and left (c) points straight up (d) points up and right
5. 5.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
6. 6.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
8. 8.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
10. 10.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a buzzer (d) a light sensor
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
12. 12.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
14. 14.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
15. 15.🦾 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 left (b) points right (c) points up and left (d) points straight up
16. 16.True or false: “has just two wires” 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 90°?
18. 18.🦾 A servo program runs:
    angle = 80
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
20. 20.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
21. 21.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 30
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
23. 23.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
24. 24.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
25. 25.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
26. 26.🦾 A servo program runs:
    angle = 130
    angle = angle + 40
    angle = angle − 60
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
28. 28.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
29. 29.🦾 A servo moves from 150° to 160°. How many degrees does it turn?
30. 30.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
32. 32.🦾 A servo moves from 70° to 40°. How many degrees does it turn?
33. 33.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
34. 34.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
35. 35.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
36. 36.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
37. 37.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
38. 38.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
39. 39.🦾 A servo program runs:
    angle = 140
    angle = angle − 10
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo moves from 120° to 0°. How many degrees does it turn?

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