Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 258 · 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.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
3. 3.🦾 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 right (c) points straight up (d) points left
4. 4.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
5. 5.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
6. 6.🦾 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 up and left (c) points right (d) points left
7. 7.🦾 A servo moves from 120° to 140°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
9. 9.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a fan (d) a servo motor
11. 11.🦾 A servo moves from 80° to 180°. How many degrees does it turn?
12. 12.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
14. 14.🦾 A servo moves from 170° to 40°. How many degrees does it turn?
15. 15.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
16. 16.🦾 A servo program runs:
    angle = 10
    angle = angle + 40
    angle = angle − 10
    angle = angle − 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
18. 18.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a buzzer (c) a servo motor (d) a DC motor
19. 19.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
21. 21.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
23. 23.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
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 right (c) points straight up (d) points up and right
25. 25.🦾 A servo program runs:
    angle = 110
    angle = angle − 10
    angle = angle − 30
    angle = angle + 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
27. 27.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
29. 29.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
32. 32.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
35. 35.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
36. 36.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
37. 37.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
38. 38.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
39. 39.🦾 A servo moves from 90° to 60°. How many degrees does it turn?
40. 40.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False

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