Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 56 · 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: “moves an arm joint” is true of a DC motor. (a) False (b) True
2. 2.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
3. 3.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
4. 4.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a DC motor (d) a light sensor
5. 5.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) shake it (d) paint it red
6. 6.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 1800° (d) 18°
7. 7.🦾 A servo moves from 10° to 40°. How many degrees does it turn?
8. 8.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
9. 9.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
11. 11.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
12. 12.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
13. 13.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
14. 14.🦾 A servo moves from 10° to 0°. How many degrees does it turn?
15. 15.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
16. 16.🦾 A servo moves from 80° to 20°. How many degrees does it turn?
17. 17.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a fan (d) a buzzer
18. 18.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
19. 19.🦾 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 up and left (c) points right (d) points up and right
20. 20.True or false: “has just two wires” is true of a DC motor. (a) True (b) False
21. 21.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
22. 22.🦾 A servo program runs:
    angle = 10
    angle = angle + 20
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo moves from 40° to 70°. How many degrees does it turn?
24. 24.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
25. 25.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
27. 27.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
28. 28.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
29. 29.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
30. 30.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
31. 31.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
32. 32.🦾 A servo moves from 90° to 140°. How many degrees does it turn?
33. 33.🦾 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 up and left (b) points left (c) points right (d) points up and right
34. 34.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
35. 35.🦾 A servo moves from 120° to 20°. How many degrees does it turn?
36. 36.🦾 A servo moves from 60° to 10°. How many degrees does it turn?
37. 37.🦾 A servo moves from 110° to 30°. How many degrees does it turn?
38. 38.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
39. 39.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
40. 40.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?

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