Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 460 · 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 moves from 150° to 170°. How many degrees does it turn?
2. 2.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
3. 3.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
4. 4.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
5. 5.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
6. 6.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
7. 7.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
8. 8.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
9. 9.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
10. 10.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
11. 11.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 1800° (c) 18° (d) 180°
13. 13.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
14. 14.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
15. 15.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
16. 16.🦾 A servo moves from 130° to 170°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
18. 18.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
19. 19.🦾 A servo program runs:
    angle = 130
    angle = angle − 10
    angle = angle − 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
22. 22.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
24. 24.🦾 A servo moves from 180° to 80°. How many degrees does it turn?
25. 25.🦾 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 right (c) points straight up (d) points left
26. 26.🦾 A servo moves from 80° to 120°. How many degrees does it turn?
27. 27.🦾 A servo program runs:
    angle = 170
    angle = angle − 60
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
28. 28.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a fan (c) a DC motor (d) a buzzer
29. 29.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
30. 30.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 20
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
31. 31.🦾 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 up and left (b) points straight up (c) points up and right (d) points right
32. 32.🦾 A servo moves from 130° to 20°. How many degrees does it turn?
33. 33.🦾 A servo program runs:
    angle = 110
    angle = angle + 20
    angle = angle + 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
35. 35.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
36. 36.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
37. 37.🦾 A servo moves from 50° to 70°. How many degrees does it turn?
38. 38.🦾 A servo moves from 60° to 30°. How many degrees does it turn?
39. 39.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
40. 40.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False

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