Electronics - Voltage and Current - Discussion

P=VI and I=V/R.

We have these two laws. And most people get confused due to this. I will answer as simply as I can and I hope that everyone can understand my explanation.

In a circuit, in order for equipment to not become damaged, the power remains constant throughout the entire operation. It is true that current and voltage are directly proportional. So if current increases so will the voltage. But, The power needs to remain constant to balance the circuit. What happens then? Voltage and current are variable but power is constant.

So in order for the power to remain constant, if voltage becomes twice its initial value current must become 1/2 of its original value.

As P = VI. So, doing this the Power stays constant and the circuit is balanced.

Electrical energy gets dissipated as heat through load.(more precisely electrical energy gets converted into heat energy) more the load more energy is spent battery certainly loose energy very fast.

Example: the battery in your digital watch will run for a long time, when you connect the same set of battery to a completely resistance load like a LED light it will drain with in minutes. Energy dissipation in that watch was less but in LED it was more, more energy was spent to drive the LED.

(more the load more the power dissipation. Its a natural phenomenon no need to break it through ohms law)

Battery voltage gets lowered when load increases.

The battery is already charged now when the load is connected it is in discharging mode.

So when load increases (here load increases means a device that we connected is drawing more current from source) voltage will come down gradually.

So it is not like R increases I decreases so V decreases.

One important thing is load resistance increases means are increasing.

But load increasing means the current that is drawing by the device is increasing.

@rajasekhar-

Current is the rate at which electric charge flows past a point in a circuit. In other words, current is the rate of flow of electric charge.
Voltage, also called electromotive force, is the potential difference in charge between two points in an electrical field. In other words, voltage is the "energy per unit charge”.

Load increase current will be increased and the voltaga remain constant. i.e if home lamps adopt maximum 1 o r2 amp current if we increase the load and motor is connected in this circuit motor consume more current then lamp that's why load increase current will be increased and voltage is constant.

Note:

In Practical Applications battery voltage is lowered as load increases.

Or

In Practical Applications battery voltage is lowered as load Resistance decreases .

Both are correct. Hope Understood meaning of Load and Load resistance.

Each and every battery has some internal resistance, as the load is increased (ie. , load resistance is lowered) current increases which results in the increase of drop across the internal resistance resulting in the decrease of the voltage.

How the current will be increased if the voltage is decreased? this is not so. according to ohm's law- V is proportional to I. so if load increases curent will be low. And the voltage also will do the same. :)

It is just like a inverter when ever the power supply is on it will get charged and as soon as the power supply goes off the battery will be enabled and the stored charge will decay exponentially

Increasing of load means an increase of current in a circuit due to a decrease in resistance.

Because for example:
1) 100W bulb at 230v has 45 ohms.
2) 1000W iron at 230v has 4.5-ohm resistance.