Why Birds are not electrocuted when they sit on power lines?

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In daily life we are seeing birds are are sit on the power line, they cannot experience electric shock because current flows in two paths

1.Current flows shortest path to ground.

2.current chooses low resistance path.

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3.R_BIRD is greater than R_wire so current doesn't flows through the bird.

4.Generally resistance of a conductor is very low( in the order of (0.2-5)).

Sometimes it can electrocuted because it can touch the another wire and gets shorted.

R=¶l/a

Where,

R= Resistance

¶= specific resistance

L= length

A= area

We know V=IR

I and R are inversely related.

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1.Generally the conductor used in transmission lines are Copper, Aluminium, silver etc.

2.Birds are bad conductors for electricity.

3.Birds didn't feel electrostatic effect also.

4. When you are very close to the high power lines our hair will align to the field and will attracted to the power line and burn out.

Resistance:

It is the property of material which opposes the flow of electric current.

In series the resistance will added up

R= R1+R2.

In parallel the resistance will decreases

R= R1*R2/R1+R2.

By ohms law

The current flowing through the conductor is directly proportional to potential difference across the conductor.

V is proportional to current

V=IR

Limitations:

1. Ohms law doesn't applicable on vaccum tubes, arc lamps, semiconductor devices.

2. It is not applicable when resistance is changed with temperature.

Ohm's Law is a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit.

To students of electronics, Ohm's Law (E = IR) is as fundamentally important as Einstein's Relativity equation (E = mc²) is to physicists.

E = I x R

When spelled out, it means voltage = current x resistance, or volts = amps x ohms, or V = A x Ω.

Named for German physicist Georg Ohm (1789-1854), Ohm's Law addresses the key quantities at work in circuits:

Ohm’s Law can be used to validate the static values of circuit components, current levels, voltage supplies, and voltage drops. If, for example, a test instrument detects a higher than normal current measurement, it could mean that resistance has decreased or that voltage has increased, causing a high-voltage situation. This could indicate a supply or circuit issue.

In direct current (dc) circuits, a lower than normal current measurement could mean that the voltage has decreased, or circuit resistance has increased. Possible causes for increased resistance are poor or loose connections, corrosion and/or damaged components.