Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 871 · 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: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
2. 2.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
4. 4.🦾 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 up and right (b) points right (c) points left (d) points up and left
5. 5.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
6. 6.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a servo motor (d) a buzzer
7. 7.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
8. 8.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
9. 9.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
10. 10.🦾 A servo program runs:
    angle = 100
    angle = angle − 30
    angle = angle − 50
    angle = angle + 60
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
11. 11.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
12. 12.🦾 A servo moves from 160° to 80°. How many degrees does it turn?
13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo program runs:
    angle = 10
    angle = angle + 50
    angle = angle + 60
    angle = angle + 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) sound only (d) light
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
18. 18.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) swap its two wires (d) paint it red
19. 19.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo program runs:
    angle = 0
    angle = angle + 30
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
21. 21.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
23. 23.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo program runs:
    angle = 170
    angle = angle − 10
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
27. 27.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 1800° (d) 10°
28. 28.🦾 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 right
29. 29.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
30. 30.🦾 A servo moves from 90° to 0°. How many degrees does it turn?
31. 31.🦾 A servo moves from 50° to 30°. How many degrees does it turn?
32. 32.🦾 A servo moves from 90° to 170°. How many degrees does it turn?
33. 33.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
34. 34.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    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 120°?
36. 36.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
37. 37.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
38. 38.🦾 A servo moves from 40° to 160°. How many degrees does it turn?
39. 39.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
40. 40.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True

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