Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 343 · 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 turns to an exact angle? (a) a servo motor (b) a DC motor
2. 2.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
3. 3.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
4. 4.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
5. 5.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
6. 6.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
7. 7.🦾 A servo moves from 100° to 120°. How many degrees does it turn?
8. 8.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
10. 10.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
11. 11.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
12. 12.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo moves from 140° to 130°. How many degrees does it turn?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
15. 15.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
16. 16.🦾 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 straight up (b) points up and right (c) points left (d) points up and left
17. 17.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo program runs:
    angle = 100
    angle = angle − 50
    angle = angle + 20
    angle = angle + 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
20. 20.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
22. 22.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
23. 23.🦾 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
24. 24.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
25. 25.⚙️ 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
26. 26.🦾 A servo program runs:
    angle = 130
    angle = angle + 50
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
28. 28.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a buzzer (d) a DC motor
29. 29.🦾 A servo moves from 120° to 40°. How many degrees does it turn?
30. 30.🦾 A servo program runs:
    angle = 50
    angle = angle − 40
    angle = angle + 10
    angle = angle − 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
32. 32.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
33. 33.🦾 A servo program runs:
    angle = 180
    angle = angle − 40
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 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 left (b) points up and right (c) points right (d) points straight up
35. 35.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
36. 36.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
37. 37.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
38. 38.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
39. 39.🦾 A servo moves from 20° to 0°. How many degrees does it turn?
40. 40.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True

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