Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 675 · 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 a signal wire? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo moves from 80° to 0°. How many degrees does it turn?
3. 3.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
4. 4.🦾 A servo moves from 140° to 110°. How many degrees does it turn?
5. 5.🦾 A servo program runs:
   angle = 50
   angle = angle − 20
   angle = angle + 50
   To what angle (in degrees) does the servo turn in the end?
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
7. 7.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
8. 8.🦾 A servo moves from 110° to 30°. How many degrees does it turn?
9. 9.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
10. 10.🦾 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 left (c) points up and right (d) points straight up
11. 11.🦾 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 straight up (c) points up and left (d) points up and right
12. 12.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
13. 13.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
15. 15.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle + 40
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
16. 16.🦾 A servo program runs:
    angle = 30
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
17. 17.🦾 A servo program runs:
    angle = 140
    angle = angle − 40
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
18. 18.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
19. 19.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
20. 20.🦾 A servo moves from 180° to 20°. How many degrees does it turn?
21. 21.True or false: “has just two wires” 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 90°?
23. 23.🦾 A servo moves from 10° to 130°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
25. 25.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
26. 26.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
27. 27.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
29. 29.🦾 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 up and left (b) points up and right (c) points left (d) points right
30. 30.⚙️ 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
31. 31.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
32. 32.🦾 A servo program runs:
    angle = 30
    angle = angle + 60
    angle = angle − 10
    angle = angle − 30
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
33. 33.⚙️ A motor changes electrical energy into … (a) sound only (b) light (c) water (d) movement
34. 34.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo moves from 130° to 120°. How many degrees does it turn?
36. 36.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
37. 37.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
39. 39.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
40. 40.🦾 A servo program runs:
    angle = 40
    angle = angle + 50
    angle = angle + 40
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?

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