Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 974 · 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 has just two wires? (a) a DC motor (b) a servo motor
2. 2.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
4. 4.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a servo motor (d) a DC motor
6. 6.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 10° (d) 180°
8. 8.🦾 A servo program runs:
   angle = 100
   angle = angle + 20
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
10. 10.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
11. 11.🦾 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 left (b) points right (c) points straight up (d) points up and right
12. 12.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
13. 13.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
14. 14.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
15. 15.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) shake it (c) paint it red (d) swap its two wires
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
18. 18.🦾 A servo moves from 150° to 10°. How many degrees does it turn?
19. 19.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
20. 20.🦾 A servo moves from 40° to 20°. How many degrees does it turn?
21. 21.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
22. 22.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
23. 23.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
24. 24.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
25. 25.🦾 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 right (d) points up and right
26. 26.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 50
    angle = angle + 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
28. 28.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
29. 29.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
31. 31.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
32. 32.🦾 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 up and left (d) points right
33. 33.🦾 A servo program runs:
    angle = 60
    angle = angle + 50
    angle = angle − 50
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.🦾 A servo moves from 0° to 70°. How many degrees does it turn?
35. 35.⚙️ A motor changes electrical energy into … (a) movement (b) light (c) sound only (d) water
36. 36.🦾 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 straight up (c) points up and left (d) points left
37. 37.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo moves from 30° to 40°. How many degrees does it turn?
39. 39.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🦾 A servo program runs:
    angle = 70
    angle = angle + 10
    angle = angle + 60
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?

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