Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 856 · 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: “spins round and round” is true of a DC motor. (a) False (b) True
2. 2.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
3. 3.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
4. 4.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
5. 5.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
6. 6.🦾 A servo program runs:
   angle = 40
   angle = angle − 20
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
7. 7.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
8. 8.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
9. 9.⚙️ A motor changes electrical energy into … (a) water (b) sound only (c) light (d) movement
10. 10.⚙️ 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
11. 11.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
12. 12.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
13. 13.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
14. 14.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
16. 16.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
17. 17.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
18. 18.🦾 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 straight up (b) points up and right (c) points left (d) points right
19. 19.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
20. 20.🦾 A servo moves from 100° to 110°. How many degrees does it turn?
21. 21.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
22. 22.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 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 left (b) points right (c) points up and right (d) points left
24. 24.🦾 A servo moves from 120° to 60°. How many degrees does it turn?
25. 25.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
26. 26.⚙️ 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
27. 27.True or false: “turns to an exact angle” is true of a DC motor. (a) False (b) True
28. 28.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
29. 29.⚙️ 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
30. 30.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
31. 31.🦾 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 up and right (b) points straight up (c) points right (d) points left
32. 32.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
33. 33.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
34. 34.⚙️ DC motor or servo motor: which one holds a set angle? (a) a servo motor (b) a DC motor
35. 35.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
38. 38.🦾 A servo program runs:
    angle = 70
    angle = angle + 50
    angle = angle + 40
    angle = angle − 10
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
39. 39.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor

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