Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 328 · 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.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
2. 2.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
3. 3.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
4. 4.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
5. 5.🦾 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 up and left (b) points up and right (c) points right (d) points left
6. 6.🦾 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 up and right (c) points up and left (d) points straight up
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
8. 8.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
9. 9.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
10. 10.🦾 A servo program runs:
    angle = 130
    angle = angle − 30
    angle = angle + 20
    angle = angle + 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
13. 13.🦾 A servo program runs:
    angle = 20
    angle = angle − 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
15. 15.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
17. 17.🦾 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 up and right (b) points up and left (c) points straight up (d) points right
18. 18.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 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
20. 20.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
22. 22.⚙️ 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
23. 23.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
24. 24.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
25. 25.🦾 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 straight up (c) points left (d) points right
26. 26.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
27. 27.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
29. 29.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo program runs:
    angle = 100
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
32. 32.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
33. 33.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
34. 34.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
36. 36.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
37. 37.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
38. 38.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
39. 39.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?

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