Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 245 · 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.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
2. 2.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
3. 3.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
4. 4.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
5. 5.🦾 A servo moves from 160° to 30°. How many degrees does it turn?
6. 6.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) add more wheels (d) swap its two wires
7. 7.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
12. 12.🦾 A servo program runs:
    angle = 10
    angle = angle + 60
    angle = angle + 30
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
14. 14.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
15. 15.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 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 up and right (b) points up and left (c) points right (d) points straight up
17. 17.🦾 A servo program runs:
    angle = 150
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 180° (d) 18°
20. 20.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
21. 21.🦾 A servo moves from 10° to 30°. How many degrees does it turn?
22. 22.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
23. 23.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
24. 24.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
27. 27.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 60
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
31. 31.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.🦾 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 left (b) points straight up (c) points right (d) points up and left
33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
34. 34.🦾 A servo moves from 100° to 160°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
38. 38.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo moves from 120° to 40°. How many degrees does it turn?
40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True

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