Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 947 · 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 120°?
2. 2.🦾 A servo moves from 20° to 10°. How many degrees does it turn?
3. 3.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
5. 5.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
8. 8.🦾 A servo moves from 160° to 40°. How many degrees does it turn?
9. 9.⚙️ 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
10. 10.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
11. 11.🦾 A servo moves from 90° to 100°. How many degrees does it turn?
12. 12.🦾 A servo moves from 140° to 180°. How many degrees does it turn?
13. 13.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo moves from 170° to 180°. How many degrees does it turn?
15. 15.🦾 A servo moves from 100° to 180°. How many degrees does it turn?
16. 16.🦾 A servo moves from 150° to 20°. How many degrees does it turn?
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
18. 18.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
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 right (b) points up and right (c) points up and left (d) points left
20. 20.🦾 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 straight up (c) points up and left (d) points up and right
21. 21.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle − 30
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
22. 22.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
23. 23.🦾 A servo moves from 60° to 120°. How many degrees does it turn?
24. 24.🦾 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 straight up (c) points left (d) points right
25. 25.🦾 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 up and right (b) points up and left (c) points straight up (d) points right
26. 26.🦾 A servo moves from 170° to 0°. How many degrees does it turn?
27. 27.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
28. 28.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
29. 29.🦾 A servo program runs:
    angle = 80
    angle = angle − 50
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
32. 32.🦾 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 straight up (b) points right (c) points left (d) points up and left
33. 33.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
34. 34.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
35. 35.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
36. 36.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
37. 37.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
38. 38.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
39. 39.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
40. 40.True or false: “spins round and round” is true of a servo motor. (a) False (b) True

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