Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 240 · 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 faster with more V” is true of a servo motor. (a) True (b) False
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
3. 3.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
5. 5.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
6. 6.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
7. 7.⚙️ DC motor or servo motor: which one reverses if wires swap? (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 30°?
9. 9.🦾 A servo moves from 90° to 150°. How many degrees does it turn?
10. 10.🦾 A servo program runs:
    angle = 170
    angle = angle − 30
    angle = angle − 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo program runs:
    angle = 180
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo program runs:
    angle = 20
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
14. 14.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
15. 15.🦾 A servo moves from 40° to 180°. How many degrees does it turn?
16. 16.🦾 A servo moves from 30° to 160°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
18. 18.🦾 A servo moves from 110° to 80°. How many degrees does it turn?
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
20. 20.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
21. 21.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 160° to 0°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo moves from 80° to 130°. How many degrees does it turn?
27. 27.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a servo motor (d) a buzzer
28. 28.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
29. 29.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
30. 30.🦾 A servo moves from 180° to 120°. How many degrees does it turn?
31. 31.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
32. 32.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
34. 34.🦾 A servo moves from 0° to 140°. How many degrees does it turn?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
36. 36.⚙️ 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
37. 37.🦾 A servo moves from 0° to 20°. How many degrees does it turn?
38. 38.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 180
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 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 right (c) points up and left (d) points up and right

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