Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 990 · 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 reverses if wires swap? (a) a DC motor (b) a servo motor
2. 2.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
3. 3.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
4. 4.🦾 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 right (c) points straight up (d) points up and right
5. 5.🦾 A servo moves from 110° to 180°. How many degrees does it turn?
6. 6.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
7. 7.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
8. 8.🦾 A servo moves from 160° to 90°. How many degrees does it turn?
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
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 drives the wheels? (a) a servo motor (b) a DC motor
12. 12.True or false: “holds a set angle” is true of a DC motor. (a) False (b) True
13. 13.🦾 A servo moves from 110° to 40°. How many degrees does it turn?
14. 14.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
15. 15.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 180° (d) 10°
16. 16.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a DC motor (d) a fan
17. 17.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
19. 19.⚙️ 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
20. 20.🦾 A servo moves from 20° to 90°. How many degrees does it turn?
21. 21.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
22. 22.🦾 A servo program runs:
    angle = 120
    angle = angle + 20
    angle = angle + 20
    angle = angle + 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
24. 24.🦾 A servo moves from 30° to 100°. How many degrees does it turn?
25. 25.🦾 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 left (c) points straight up (d) points right
26. 26.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
27. 27.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
28. 28.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
29. 29.True or false: “has a signal wire” is true of a servo 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 right (d) points up and left
31. 31.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
34. 34.🦾 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 left (b) points up and right (c) points straight up (d) points right
35. 35.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
36. 36.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
37. 37.True or false: “turns to an exact angle” is true of a servo motor. (a) True (b) False
38. 38.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
39. 39.🦾 A servo moves from 30° to 20°. How many degrees does it turn?
40. 40.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a light sensor (c) a buzzer (d) a servo motor

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids