Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 39 · 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 drives the wheels? (a) a servo motor (b) a DC motor
2. 2.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
3. 3.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
6. 6.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
7. 7.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
8. 8.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
9. 9.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
10. 10.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
11. 11.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
12. 12.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
13. 13.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
14. 14.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
16. 16.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
17. 17.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
18. 18.🦾 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
19. 19.🦾 A servo program runs:
    angle = 40
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
21. 21.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
23. 23.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
24. 24.🦾 A servo program runs:
    angle = 60
    angle = angle + 40
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
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 left (b) points right (c) points straight up (d) points up and right
26. 26.🦾 A servo program runs:
    angle = 170
    angle = angle + 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo moves from 90° to 160°. How many degrees does it turn?
29. 29.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
30. 30.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
31. 31.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
32. 32.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
33. 33.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
34. 34.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
35. 35.🦾 A servo moves from 50° to 20°. How many degrees does it turn?
36. 36.🦾 A servo moves from 90° to 80°. How many degrees does it turn?
37. 37.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
38. 38.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 0
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?

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