Upcoming SlideShare
×

# Virtual ground

746 views
658 views

Published on

This presentation has the details about the Virtual Ground

0 Likes
Statistics
Notes
• Full Name
Comment goes here.

Are you sure you want to Yes No
• Be the first to comment

• Be the first to like this

Views
Total views
746
On SlideShare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
12
0
Likes
0
Embeds 0
No embeds

No notes for slide

### Virtual ground

1. 2. Introduction <ul><li>A virtual ground is no more than a voltage divider where the divided network is the ground and the outer of the network are connected to the + & - of the single source of energy. </li></ul><ul><li>Virtual ground is a point in a circuit which is at ground potential (0 volts) but is NOT connected to ground .  </li></ul>
2. 3. Virtual Ground
3. 4. Virtual Ground circuit
4. 5. Virtual Ground Circuit 1
5. 6. Circuit 1 <ul><li>In this circuit V1 (the left-hand battery) supplies +10 volts to the circuit while V2 (the right-hand battery) supplies -10 volts to the circuit. </li></ul><ul><li>The total difference in potential in the circuit is 20 volts . </li></ul>
6. 7. Total Resistance of the circuit <ul><li>The total resistance of the circuit can be calculated: </li></ul>
7. 8. Total Current of the circuit <ul><li>The total resistance of the circuit can be calculated: </li></ul>
8. 9. Voltage drop across the R1 <ul><li>The voltage drop across R1 can be computed: </li></ul>
9. 10. Voltage drop across the R2 <ul><li>To check this result, compute the voltage drop across R2 and subtract this from the voltage at point A . </li></ul><ul><li>The result should be the voltage of V2 . </li></ul>
10. 11. Voltage at point A <ul><li>The voltage at point A would be equal to the voltage of V1 minus the voltage drop of R1 . </li></ul>
11. 12. <ul><li>It is not necessary that the voltage supplies be equal to create a point of virtual ground . </li></ul>Voltage of the circuit
12. 13. Virtual Ground Circuit 2
13. 14. Total Resistance <ul><li>In this circuit V1 supplies +1 volt to the circuit while V2 supplies -10 volts. </li></ul><ul><li>The total difference in potential is 11 volts . </li></ul><ul><li>The total resistance of this circuit (R1 + R2) is 11 ohms . </li></ul>
14. 15. Voltage drop <ul><li>The total current (I T ) is 1 ampere . </li></ul><ul><li>The voltage drop across R1 (E  R1  = R 1  X I T ) is 1 volt . </li></ul><ul><li>The voltage drop across R2 (E R2  = R2 X I  T ) is 10 volts . </li></ul>
15. 16. Voltage at point A <ul><li>The voltage at point A can be computed: </li></ul>
16. 17. Voltage at V2 <ul><li>So point A is at virtual ground in this circuit also. </li></ul><ul><li>To check the results, compute the voltage at V2 . </li></ul>
17. 18. The End <ul><li>…… . Thank You …….. </li></ul>