Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 51 · 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.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
2. 2.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.⚙️ 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
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
7. 7.🦾 A servo moves from 40° to 100°. How many degrees does it turn?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
10. 10.🦾 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 left (c) points up and right (d) points straight up
11. 11.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
12. 12.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
13. 13.🦾 A servo moves from 20° to 30°. How many degrees does it turn?
14. 14.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
15. 15.🦾 A servo moves from 100° to 50°. How many degrees does it turn?
16. 16.🦾 A servo program runs:
    angle = 150
    angle = angle − 40
    angle = angle − 20
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo program runs:
    angle = 110
    angle = angle − 50
    angle = angle + 20
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
19. 19.🦾 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 left (b) points straight up (c) points up and left (d) points right
20. 20.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
21. 21.🦾 A servo program runs:
    angle = 130
    angle = angle + 20
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
22. 22.🦾 A servo moves from 20° to 40°. How many degrees does it turn?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.🦾 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 left (b) points up and left (c) points up and right (d) points right
25. 25.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
27. 27.⚙️ 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
28. 28.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
29. 29.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
30. 30.🦾 A servo moves from 30° to 10°. How many degrees does it turn?
31. 31.🦾 A servo moves from 90° to 60°. How many degrees does it turn?
32. 32.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
33. 33.🦾 A servo moves from 160° to 140°. How many degrees does it turn?
34. 34.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
35. 35.🦾 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 straight up (c) points up and left (d) points right
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
37. 37.🦾 A servo moves from 120° to 20°. How many degrees does it turn?
38. 38.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo moves from 160° to 130°. How many degrees does it turn?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?

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