# Ohm's Law Simulation

Grades 10th - 12th by Ankush Naskar

1 Ω

2 Ω

3 Ω

∼ 0 Ω

12 V

0 A

0 A

0 A

0 A

Don't forget to turn on the switch! Current flows at speed of light. It's slowed down here.

**Instructions** : Drag and drop the resistors into the drop areas (dashed grey boxes) and find out the relation between voltage (V), current (I) and resistance (R) of circuit.

### What is Resistance?

Resistance is the measure of obstruction offered to the flow of electric current through a material. The SI unit of electrical resistance is ohm (Ω). It depends upon the nature of material, length of the conductor and cross-section area of the wire.

### What is Ohms Law?

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

So,

`I = V/R`

where

`V`

is voltage,

`I`

is current and

`R`

is resistance of circuit. Or, rearranging,

`V = I × R`

.

### What is a Series Circuit?

When the components are connected end to end in a sequence, we call it a series circuit. The current flows along a single path so the current through each component remains the same. There is a different voltage drop across each component depending upon its resistance (as per Ohm's law,

`V`_{n} = I_{circuit} × R_{n}

). The sum of voltages across each component is equal to the total voltage provided by the power source (

`V`_{circuit} = V_{1}+V_{2}+...+V_{n}

).

### What is a Parallel Circuit?

When each component is individually connected to the power source such that the current can take multiple paths, we call it a parallel circuit. Each component gets the same voltage and draws a different current depending upon its resistance (as per Ohm's law,

`I`_{n} = V_{circuit}/R_{n}

). The sum of currents through each component is equal to the total current flowing through the circuit (

`I`_{circuit} = I_{1}+I_{2}+...+I_{n}

).