Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 789 · 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 30° to 180°. How many degrees does it turn?
2. 2.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
3. 3.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
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: “spins faster with more V” is true of a servo motor. (a) False (b) True
6. 6.🦾 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 left (b) points straight up (c) points right (d) points up and right
7. 7.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
8. 8.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
9. 9.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
10. 10.⚙️ 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
11. 11.🦾 A servo moves from 0° to 80°. How many degrees does it turn?
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
13. 13.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
14. 14.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
15. 15.⚙️ 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
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
18. 18.🦾 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 right (b) points right (c) points left (d) points straight up
19. 19.⚙️ A motor changes electrical energy into … (a) light (b) water (c) movement (d) sound only
20. 20.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle + 60
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
22. 22.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
23. 23.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
24. 24.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
25. 25.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
26. 26.🦾 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 straight up (c) points right (d) points left
27. 27.🦾 A servo program runs:
    angle = 90
    angle = angle + 10
    angle = angle − 30
    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 60°?
29. 29.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
30. 30.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
31. 31.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo moves from 130° to 0°. How many degrees does it turn?
33. 33.🦾 A servo moves from 20° to 50°. How many degrees does it turn?
34. 34.🦾 A servo moves from 180° to 10°. How many degrees does it turn?
35. 35.🦾 A servo moves from 180° to 130°. How many degrees does it turn?
36. 36.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
37. 37.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 120
    angle = angle + 40
    angle = angle − 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
40. 40.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor

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