Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 628 · 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 moves from 80° to 150°. How many degrees does it turn?
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
3. 3.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
6. 6.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
7. 7.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
8. 8.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
9. 9.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
10. 10.🦾 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 right (b) points straight up (c) points right (d) points left
11. 11.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
12. 12.🦾 A servo moves from 170° to 80°. How many degrees does it turn?
13. 13.🦾 A servo program runs:
    angle = 20
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
14. 14.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
15. 15.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
19. 19.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
20. 20.🦾 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 left (b) points left (c) points up and right (d) points right
21. 21.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
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 up and left (b) points straight up (c) points right (d) points left
23. 23.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
27. 27.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo program runs:
    angle = 90
    angle = angle − 50
    angle = angle + 60
    angle = angle − 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
30. 30.🦾 A servo moves from 90° to 10°. How many degrees does it turn?
31. 31.🦾 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 straight up (c) points up and left (d) points right
32. 32.🦾 A servo program runs:
    angle = 100
    angle = angle − 60
    angle = angle + 60
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
33. 33.True or false: “turns to an exact angle” 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 30°?
35. 35.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo moves from 30° to 170°. How many degrees does it turn?
37. 37.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
38. 38.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
39. 39.🦾 A servo moves from 50° to 10°. How many degrees does it turn?
40. 40.🦾 A servo moves from 60° to 0°. How many degrees does it turn?

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