Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 410 · 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 turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
2. 2.🦾 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 up and right (b) points left (c) points up and left (d) points straight up
3. 3.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
5. 5.🦾 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 up and left (c) points straight up (d) points left
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
7. 7.🦾 A servo moves from 160° 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 drives the wheels? (a) a DC motor (b) a servo motor
10. 10.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
11. 11.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo program runs:
    angle = 110
    angle = angle − 30
    angle = angle − 60
    angle = angle + 50
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
14. 14.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
17. 17.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
19. 19.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
21. 21.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
22. 22.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
23. 23.🦾 A servo moves from 120° to 180°. How many degrees does it turn?
24. 24.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
25. 25.🦾 A servo program runs:
    angle = 80
    angle = angle + 30
    angle = angle + 10
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
26. 26.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
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 straight up (b) points left (c) points up and right (d) points right
28. 28.🦾 A servo moves from 10° to 100°. How many degrees does it turn?
29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
30. 30.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
32. 32.⚙️ 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
33. 33.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 50
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo program runs:
    angle = 20
    angle = angle + 40
    angle = angle − 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
36. 36.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
37. 37.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
38. 38.🦾 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 straight up (b) points right (c) points up and right (d) points left
39. 39.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
40. 40.🦾 A servo moves from 110° to 80°. How many degrees does it turn?

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