Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 67 · 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 moves an arm joint? (a) a DC motor (b) a servo motor
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
3. 3.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
4. 4.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
5. 5.🦾 A servo program runs:
   angle = 20
   angle = angle + 50
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) add more wheels (d) shake it
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
8. 8.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
9. 9.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
10. 10.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
11. 11.🦾 A servo program runs:
    angle = 110
    angle = angle + 50
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
12. 12.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 30
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
14. 14.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a servo motor (d) a buzzer
15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
17. 17.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
19. 19.🦾 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 left (b) points left (c) points right (d) points straight up
20. 20.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
21. 21.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 18° (d) 10°
22. 22.True or false: “has just two wires” is true of a DC 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 135°. Where does the arm point? (a) points straight up (b) points up and left (c) points right (d) points up and right
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
25. 25.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
26. 26.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
27. 27.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
29. 29.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
30. 30.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
31. 31.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle − 40
    angle = angle + 50
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo moves from 140° to 60°. How many degrees does it turn?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
35. 35.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
36. 36.🦾 A servo moves from 40° to 140°. How many degrees does it turn?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
38. 38.🦾 A servo moves from 140° to 40°. How many degrees does it turn?
39. 39.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
40. 40.True or false: “spins round and round” is true of a servo motor. (a) True (b) False

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