How to calculate current and voltage drop in circuit

In this article, we are going to know about Calculation of current and voltage drop in circuit.


Calculation of current in circuit


As per below image of circuit one resistor R1 connected in series & Two resistor R2, R3 are connected in parallel .

Calculation of current in circuit

As per Ohm’s Law Formula:

I = V / RT

As per circuit first we need to calculate the total resistance.

Parallel resistance formula:

Rp = R2 X R/ R+ R3

Rp = 20 X 30 / 50

Rp = 12 E

 Calculation of current in circuit

Now we will calculate the total resistance as per series resistance formula .
RT = R1 + RP
RT = 10 + 12 = 22 E
Now we will calculate the current as per OHM’s Law.
I = V / RT
I = 9 / 22 = 0.409 A


Calculation of voltage drop in circuit


As per below image of circuit have one battery & two resistor R1 & R2 connected in series.

Calculation of voltage drop in circuit

As per circuit first we need to calculate the total resistance.

Series resistance formula:

RT = R1+ R2

RT = 2 + 3

RT = 5 E

As per Ohm’s Law Formula:

I = V / RT

V = I RT

20 = I 5

I = 20/5 = 4A

Now first we will calculate the voltage drop across the R1.

V1 = IXR1

V1 = 4 X 2 = 8 V

Now first we will calculate the voltage drop across the R2.

V2 = 4 X 3 = 12 V

 

As per new circuit if three resistor are connected in series.

Calculation of voltage drop in circuit

Series resistance formula:

RT = R1+ R+ R3

RT = 3 + 4 + 5  

RT = 12 E

As per Ohm’s Law Formula:

I = V / RT

V = I RT

36 = I 12

I = 36/12 = 3A

Now first we will calculate the voltage drop across the R1.

V1 = IXR1

V1 = 5 X 3 = 15 V

Now first we will calculate the voltage drop across the R2.

V2 = 4 X 3 = 12 V

Now we will calculate the voltage drop across the R3.

V2 = 3 X 3 = 9 V

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