Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 174 · 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 common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 10° (d) 1800°
2. 2.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
3. 3.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a fan (d) a servo motor
4. 4.🦾 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
5. 5.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
6. 6.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a DC motor (d) a buzzer
7. 7.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
8. 8.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
10. 10.🦾 A servo program runs:
    angle = 140
    angle = angle + 10
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
11. 11.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
12. 12.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
13. 13.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
14. 14.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
17. 17.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
18. 18.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
19. 19.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
20. 20.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
22. 22.🦾 A servo moves from 40° to 10°. How many degrees does it turn?
23. 23.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
24. 24.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
25. 25.🦾 A servo program runs:
    angle = 40
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.🦾 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 straight up (c) points left (d) points up and right
27. 27.🦾 A servo program runs:
    angle = 100
    angle = angle − 40
    angle = angle + 40
    angle = angle + 60
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
28. 28.🦾 A servo moves from 20° to 80°. How many degrees does it turn?
29. 29.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
30. 30.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
31. 31.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
32. 32.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo moves from 110° to 10°. How many degrees does it turn?
34. 34.🦾 A servo moves from 20° to 120°. How many degrees does it turn?
35. 35.🦾 A servo program runs:
    angle = 110
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
38. 38.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) movement (d) light
39. 39.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
40. 40.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False

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