Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 205 · 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 left (c) points right (d) points up and right
2. 2.🦾 A servo moves from 70° to 130°. How many degrees does it turn?
3. 3.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
4. 4.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
8. 8.🦾 A servo moves from 40° to 160°. How many degrees does it turn?
9. 9.🦾 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 up and right (c) points left (d) points up and left
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
11. 11.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
12. 12.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
13. 13.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
15. 15.🦾 A servo moves from 60° to 50°. How many degrees does it turn?
16. 16.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle − 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a DC motor (d) a servo motor
18. 18.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) light (d) sound only
19. 19.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
22. 22.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
23. 23.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
24. 24.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
25. 25.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
26. 26.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo program runs:
    angle = 150
    angle = angle + 30
    angle = angle − 40
    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 150°?
29. 29.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 30
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
31. 31.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
32. 32.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
33. 33.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
35. 35.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 100
    angle = angle − 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
40. 40.🦾 A servo moves from 40° to 10°. How many degrees does it turn?

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