Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 590 · 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 right (b) points up and right (c) points up and left (d) points straight up
2. 2.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
3. 3.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
4. 4.🦾 A servo moves from 0° to 180°. How many degrees does it turn?
5. 5.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
6. 6.🦾 A servo moves from 180° to 140°. How many degrees does it turn?
7. 7.🦾 A servo program runs:
   angle = 90
   angle = angle + 10
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
8. 8.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
9. 9.⚙️ A motor changes electrical energy into … (a) sound only (b) movement (c) light (d) water
10. 10.🦾 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 right (c) points up and left (d) points left
11. 11.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) paint it red (c) swap its two wires (d) add more wheels
12. 12.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
13. 13.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
14. 14.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
15. 15.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
16. 16.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
20. 20.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a buzzer (d) a DC motor
21. 21.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
22. 22.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
23. 23.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
24. 24.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
25. 25.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
26. 26.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
29. 29.🦾 A servo moves from 10° to 70°. How many degrees does it turn?
30. 30.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
31. 31.🦾 A servo moves from 60° to 40°. How many degrees does it turn?
32. 32.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
34. 34.⚙️ A common servo can turn from 0° up to about … (a) 1800° (b) 180° (c) 10° (d) 18°
35. 35.🦾 A servo program runs:
    angle = 120
    angle = angle + 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
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 left (b) points straight up (c) points left (d) points up and right
37. 37.🦾 A servo program runs:
    angle = 150
    angle = angle + 10
    angle = angle − 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
38. 38.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
39. 39.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
40. 40.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor

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