Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 316 · 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) sound only (b) water (c) light (d) movement
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
4. 4.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
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 light sensor (d) a buzzer
8. 8.🦾 A servo moves from 180° to 140°. How many degrees does it turn?
9. 9.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
11. 11.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
13. 13.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
15. 15.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
17. 17.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
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 up and right (b) points up and left (c) points right (d) points left
19. 19.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
22. 22.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
23. 23.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 130
    angle = angle + 10
    angle = angle − 20
    angle = angle − 40
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
26. 26.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo moves from 160° to 140°. How many degrees does it turn?
28. 28.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
29. 29.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 60
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 50
    angle = angle − 30
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
33. 33.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
35. 35.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 40
    angle = angle + 20
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo moves from 180° to 150°. How many degrees does it turn?
38. 38.🦾 A servo moves from 60° to 50°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 40
    angle = angle − 10
    angle = angle + 20
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True

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