Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 779 · 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 program runs:
   angle = 30
   angle = angle + 10
   angle = angle − 30
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a DC motor (c) a buzzer (d) a fan
3. 3.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
4. 4.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
5. 5.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) add more wheels (d) swap its two wires
6. 6.🦾 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 right (b) points up and right (c) points straight up (d) points left
7. 7.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
8. 8.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
10. 10.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
11. 11.🦾 A servo moves from 30° to 180°. How many degrees does it turn?
12. 12.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
13. 13.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
14. 14.🦾 A servo program runs:
    angle = 170
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
15. 15.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
16. 16.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a DC motor (d) a servo motor
17. 17.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle + 20
    angle = angle − 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
18. 18.⚙️ A motor changes electrical energy into … (a) water (b) light (c) sound only (d) movement
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
21. 21.🦾 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 straight up (b) points left (c) points up and left (d) points right
22. 22.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
23. 23.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
24. 24.🦾 A servo moves from 100° to 90°. How many degrees does it turn?
25. 25.🦾 A servo moves from 40° to 60°. How many degrees does it turn?
26. 26.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
27. 27.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
28. 28.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
29. 29.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo program runs:
    angle = 140
    angle = angle − 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
31. 31.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
32. 32.🦾 A servo moves from 30° to 80°. How many degrees does it turn?
33. 33.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
34. 34.🦾 A servo moves from 110° to 10°. How many degrees does it turn?
35. 35.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
36. 36.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
37. 37.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo moves from 90° to 140°. How many degrees does it turn?
39. 39.🦾 A servo moves from 0° to 150°. How many degrees does it turn?
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?

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