Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 243 · 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 common servo can turn from 0° up to about … (a) 10° (b) 18° (c) 180° (d) 1800°
2. 2.⚙️ DC motor or servo motor: which one has just two wires? (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 90°?
4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
5. 5.🦾 A servo program runs:
   angle = 50
   angle = angle + 40
   angle = angle − 10
   angle = angle + 30
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
7. 7.🦾 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 right (d) points up and left
8. 8.🦾 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 left (b) points right (c) points straight up (d) points up and right
9. 9.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
11. 11.🦾 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 up and left (b) points up and right (c) points right (d) points straight up
12. 12.🦾 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 up and right (b) points left (c) points up and left (d) points straight up
13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
14. 14.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
16. 16.🦾 A servo moves from 90° to 120°. How many degrees does it turn?
17. 17.🦾 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 right (b) points up and left (c) points up and right (d) points left
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a buzzer (d) a servo motor
19. 19.🦾 A servo program runs:
    angle = 30
    angle = angle − 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
21. 21.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
22. 22.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
24. 24.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 40
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
25. 25.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
26. 26.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) paint it red (d) shake it
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) light (d) water
29. 29.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
31. 31.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
32. 32.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
33. 33.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
34. 34.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
35. 35.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
36. 36.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
37. 37.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
38. 38.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?

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