Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 159 · 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 motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
2. 2.🦾 A servo moves from 60° to 150°. How many degrees does it turn?
3. 3.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
4. 4.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
6. 6.🦾 A servo moves from 140° to 150°. How many degrees does it turn?
7. 7.🦾 A servo moves from 130° to 20°. How many degrees does it turn?
8. 8.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
10. 10.🦾 A servo moves from 120° to 60°. How many degrees does it turn?
11. 11.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
12. 12.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
13. 13.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
14. 14.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 10
    angle = angle − 40
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
15. 15.🦾 A servo program runs:
    angle = 160
    angle = angle − 10
    angle = angle − 50
    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 45°. Where does the arm point? (a) points right (b) points up and left (c) points left (d) points up and right
17. 17.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 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 right (b) points up and right (c) points up and left (d) points left
19. 19.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo program runs:
    angle = 30
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
22. 22.⚙️ 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
23. 23.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and left (b) points left (c) points straight up (d) points right
24. 24.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
25. 25.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo program runs:
    angle = 90
    angle = angle − 20
    angle = angle + 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
29. 29.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
30. 30.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
34. 34.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
36. 36.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
37. 37.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
40. 40.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 30
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?

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