Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 523 · 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 has just two wires? (a) a servo motor (b) a DC motor
2. 2.🦾 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 right (c) points left (d) points up and right
3. 3.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
4. 4.🦾 A servo moves from 70° to 80°. How many degrees does it turn?
5. 5.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
6. 6.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
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 servo motor. (a) True (b) False
9. 9.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
11. 11.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
12. 12.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 10° (d) 18°
13. 13.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) light (d) movement
14. 14.🦾 A servo moves from 140° to 20°. How many degrees does it turn?
15. 15.🦾 A servo moves from 180° to 90°. How many degrees does it turn?
16. 16.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
17. 17.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
18. 18.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
19. 19.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
20. 20.🦾 A servo moves from 70° to 50°. How many degrees does it turn?
21. 21.⚙️ 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
22. 22.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
23. 23.🦾 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 right (c) points up and right (d) points straight up
24. 24.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
25. 25.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo moves from 170° to 150°. How many degrees does it turn?
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
28. 28.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
29. 29.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
30. 30.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
31. 31.True or false: “turns to an exact angle” is true of a servo motor. (a) False (b) True
32. 32.🦾 A servo moves from 140° to 30°. How many degrees does it turn?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle − 20
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
35. 35.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
36. 36.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
37. 37.🦾 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 left (b) points right (c) points straight up (d) points up and left
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
39. 39.🦾 A servo moves from 100° to 30°. How many degrees does it turn?
40. 40.🦾 A servo program runs:
    angle = 30
    angle = angle + 50
    angle = angle + 30
    angle = angle + 60
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?

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