Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 189 · 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 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 left (c) points up and left (d) points right
2. 2.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
3. 3.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
4. 4.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
6. 6.🦾 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 straight up (b) points right (c) points up and right (d) points up and left
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
9. 9.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
10. 10.⚙️ 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
11. 11.🦾 A servo moves from 40° to 150°. How many degrees does it turn?
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
13. 13.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
16. 16.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
17. 17.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) water (d) sound only
18. 18.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
19. 19.🦾 A servo program runs:
    angle = 150
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle + 50
    angle = angle − 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 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 left (b) points right (c) points straight up (d) points up and right
23. 23.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
24. 24.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
25. 25.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
26. 26.🦾 A servo program runs:
    angle = 120
    angle = angle + 10
    angle = angle − 60
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 10
    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 90°?
29. 29.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
30. 30.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
31. 31.🦾 A servo moves from 180° to 150°. How many degrees does it turn?
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
33. 33.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
34. 34.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
35. 35.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
36. 36.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 150
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 1800° (d) 180°
39. 39.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
40. 40.🦾 A servo moves from 40° to 120°. How many degrees does it turn?

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