Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 359 · 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 spins faster with more V? (a) a servo motor (b) a DC motor
2. 2.🦾 A servo moves from 20° to 160°. How many degrees does it turn?
3. 3.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
5. 5.🦾 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 left (c) points up and right (d) points up and left
6. 6.🦾 A servo moves from 30° to 70°. How many degrees does it turn?
7. 7.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
8. 8.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
9. 9.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a light sensor (d) a servo motor
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
11. 11.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
12. 12.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a servo motor (c) a buzzer (d) a DC motor
13. 13.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
14. 14.🦾 A servo program runs:
    angle = 20
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
15. 15.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
16. 16.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
17. 17.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
18. 18.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
20. 20.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
21. 21.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
22. 22.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
23. 23.🦾 A servo moves from 120° to 60°. How many degrees does it turn?
24. 24.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
26. 26.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
27. 27.🦾 A servo moves from 80° to 60°. How many degrees does it turn?
28. 28.🦾 A servo program runs:
    angle = 130
    angle = angle − 60
    angle = angle + 40
    To what angle (in degrees) does the servo turn in the end?
29. 29.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
30. 30.🦾 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 left (b) points up and right (c) points up and left (d) points right
31. 31.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
32. 32.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
33. 33.🦾 A servo program runs:
    angle = 0
    angle = angle + 60
    angle = angle + 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
35. 35.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
36. 36.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
37. 37.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle + 10
    angle = angle − 60
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
38. 38.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
39. 39.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
40. 40.🦾 A servo program runs:
    angle = 30
    angle = angle − 10
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?

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