Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 26 · 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 holds a set angle? (a) a DC motor (b) a servo motor
2. 2.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
3. 3.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
4. 4.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a buzzer (c) a servo motor (d) a DC motor
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
6. 6.🦾 A servo moves from 180° to 30°. How many degrees does it turn?
7. 7.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
10. 10.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
11. 11.🦾 A servo moves from 170° to 60°. How many degrees does it turn?
12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
13. 13.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
14. 14.🦾 A servo moves from 50° to 130°. How many degrees does it turn?
15. 15.🦾 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 right (b) points up and right (c) points straight up (d) points left
16. 16.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 10° (c) 18° (d) 180°
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
20. 20.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo program runs:
    angle = 90
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
22. 22.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
23. 23.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
24. 24.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle + 50
    angle = angle + 10
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 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 right (c) points left (d) points up and left
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
29. 29.🦾 A servo moves from 140° to 60°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 40
    angle = angle − 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 A servo moves from 90° to 150°. How many degrees does it turn?
32. 32.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
34. 34.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
35. 35.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
37. 37.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
39. 39.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
40. 40.🦾 A servo moves from 150° to 40°. How many degrees does it turn?

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