Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 21 · 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.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
2. 2.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
3. 3.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
4. 4.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
5. 5.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
6. 6.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
7. 7.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
8. 8.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
9. 9.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
10. 10.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
11. 11.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
12. 12.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
14. 14.🦾 A servo moves from 170° to 70°. How many degrees does it turn?
15. 15.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
16. 16.🦾 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 right (b) points straight up (c) points left (d) points right
17. 17.🦾 A servo moves from 180° to 110°. How many degrees does it turn?
18. 18.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a DC motor (d) a buzzer
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
20. 20.🦾 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 left (b) points right (c) points straight up (d) points up and right
21. 21.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
22. 22.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) paint it red (c) shake it (d) swap its two wires
23. 23.🦾 A servo moves from 0° to 90°. How many degrees does it turn?
24. 24.🦾 A servo moves from 100° to 140°. How many degrees does it turn?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
26. 26.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
27. 27.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
28. 28.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a servo motor (c) a light sensor (d) a buzzer
29. 29.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
30. 30.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
32. 32.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
33. 33.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
34. 34.🦾 A servo program runs:
    angle = 30
    angle = angle + 30
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.🦾 A servo program runs:
    angle = 60
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
37. 37.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
39. 39.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
40. 40.🦾 A servo moves from 180° to 20°. How many degrees does it turn?

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