Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 630 · 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 motor changes electrical energy into … (a) light (b) water (c) sound only (d) movement
2. 2.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
4. 4.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
5. 5.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
7. 7.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
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.🦾 A servo program runs:
   angle = 10
   angle = angle + 30
   angle = angle + 30
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
10. 10.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
11. 11.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
12. 12.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
13. 13.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
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 up and left (c) points up and right (d) points left
15. 15.🦾 A servo moves from 130° to 60°. How many degrees does it turn?
16. 16.🦾 A servo moves from 60° to 160°. How many degrees does it turn?
17. 17.🦾 A servo program runs:
    angle = 40
    angle = angle + 10
    angle = angle − 40
    angle = angle + 50
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
20. 20.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
21. 21.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
22. 22.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
24. 24.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo moves from 140° to 40°. How many degrees does it turn?
26. 26.🦾 A servo moves from 20° to 40°. How many degrees does it turn?
27. 27.🦾 A servo program runs:
    angle = 50
    angle = angle − 10
    angle = angle − 30
    angle = angle + 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
29. 29.🦾 A servo moves from 40° to 30°. How many degrees does it turn?
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
31. 31.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
32. 32.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
33. 33.🦾 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 up and left (b) points straight up (c) points right (d) points left
34. 34.🦾 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 right (b) points straight up (c) points up and right (d) points up and left
35. 35.🦾 A servo moves from 130° to 50°. How many degrees does it turn?
36. 36.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a DC motor (c) a buzzer (d) a servo motor
37. 37.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
39. 39.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
40. 40.True or false: “has just two wires” is true of a servo motor. (a) True (b) False

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