Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 738 · 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 45°. Where does the arm point? (a) points up and left (b) points straight up (c) points up and right (d) points right
2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
3. 3.🦾 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 straight up (d) points up and right
4. 4.🦾 A servo moves from 90° to 50°. How many degrees does it turn?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
7. 7.🦾 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 left (b) points up and right (c) points right (d) points straight up
8. 8.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
9. 9.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
10. 10.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
11. 11.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
12. 12.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
13. 13.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
14. 14.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
17. 17.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
18. 18.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
20. 20.🦾 A servo moves from 110° to 130°. How many degrees does it turn?
21. 21.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
22. 22.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
25. 25.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
26. 26.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
27. 27.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
28. 28.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
29. 29.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
30. 30.🦾 A servo program runs:
    angle = 160
    angle = angle − 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle − 10
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.🦾 A servo program runs:
    angle = 30
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 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 left (b) points up and right (c) points left (d) points straight up
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
37. 37.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo moves from 150° to 10°. How many degrees does it turn?
39. 39.🦾 A servo moves from 30° to 90°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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