Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 386 · 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.🦾 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 left (b) points right (c) points straight up (d) points left
2. 2.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
3. 3.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo program runs:
   angle = 180
   angle = angle − 50
   angle = angle + 30
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
7. 7.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
8. 8.🦾 A servo moves from 80° to 140°. How many degrees does it turn?
9. 9.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
10. 10.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
11. 11.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
12. 12.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
13. 13.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
16. 16.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
17. 17.🦾 A servo moves from 130° to 90°. How many degrees does it turn?
18. 18.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
19. 19.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
22. 22.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
24. 24.🦾 A servo program runs:
    angle = 10
    angle = angle + 30
    angle = angle + 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
27. 27.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
28. 28.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a servo motor (d) a light sensor
29. 29.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
30. 30.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) movement (d) water
31. 31.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) shake it (d) add more wheels
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
33. 33.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points left (b) points straight up (c) points up and right (d) points right
34. 34.🦾 A servo moves from 90° to 30°. How many degrees does it turn?
35. 35.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 90
    angle = angle − 10
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
39. 39.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a fan (d) a buzzer
40. 40.🦾 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 up and right (b) points up and left (c) points left (d) points right

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