Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 96 · 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) movement (d) light
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
3. 3.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
6. 6.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
7. 7.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
8. 8.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
9. 9.🦾 A servo moves from 160° to 70°. How many degrees does it turn?
10. 10.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
11. 11.🦾 A servo moves from 0° to 60°. How many degrees does it turn?
12. 12.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo moves from 160° to 80°. How many degrees does it turn?
15. 15.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
19. 19.🦾 A servo moves from 130° to 20°. How many degrees does it turn?
20. 20.🦾 A servo moves from 50° to 110°. How many degrees does it turn?
21. 21.🦾 A servo moves from 180° to 140°. How many degrees does it turn?
22. 22.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
23. 23.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
26. 26.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
27. 27.🦾 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 right (b) points up and right (c) points straight up (d) points left
28. 28.🦾 A servo moves from 110° to 120°. How many degrees does it turn?
29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
30. 30.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
31. 31.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
33. 33.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 50
    angle = angle − 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 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 right (b) points straight up (c) points up and right (d) points left
35. 35.🦾 A servo program runs:
    angle = 70
    angle = angle + 40
    angle = angle + 10
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
37. 37.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
38. 38.🦾 A servo program runs:
    angle = 10
    angle = angle + 10
    angle = angle + 50
    angle = angle + 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
40. 40.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True

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