Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 858 · 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.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a fan (c) a servo motor (d) a buzzer
2. 2.🦾 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 straight up (b) points right (c) points up and left (d) points up and right
3. 3.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
4. 4.🦾 A servo program runs:
   angle = 120
   angle = angle − 60
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
5. 5.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
6. 6.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
7. 7.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) water (d) sound only
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
9. 9.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
10. 10.⚙️ 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
11. 11.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
12. 12.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
14. 14.🦾 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 straight up (c) points left (d) points up and right
15. 15.⚙️ 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
16. 16.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
17. 17.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
18. 18.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
19. 19.🦾 A servo moves from 160° to 100°. How many degrees does it turn?
20. 20.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
21. 21.🦾 A servo moves from 90° to 170°. How many degrees does it turn?
22. 22.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
23. 23.🦾 A servo moves from 100° to 150°. How many degrees does it turn?
24. 24.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
25. 25.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 18° (c) 180° (d) 10°
26. 26.🦾 A servo program runs:
    angle = 180
    angle = angle − 10
    angle = angle − 20
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
27. 27.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
28. 28.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
29. 29.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
30. 30.🦾 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 right (b) points straight up (c) points up and left (d) points up and right
31. 31.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
32. 32.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
33. 33.🦾 A servo moves from 90° to 130°. How many degrees does it turn?
34. 34.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
35. 35.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
36. 36.🦾 A servo moves from 60° to 180°. How many degrees does it turn?
37. 37.🦾 A servo program runs:
    angle = 30
    angle = angle + 10
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
38. 38.🦾 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 up and right (c) points right (d) points up and left
39. 39.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor

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