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## Why does the voltage increase when it leaves the power station?

before electrical power leaves a power station – it is transferred at high voltages by using ‘step-up’ transformers to increase the voltage to around 275,000 V. before electrical power enters homes and factories – the voltages are decreased by ‘step-down’ transformers to 230 V.

## Why is the voltage of electricity generated in a power station stepped up before transmission?

Electricity is often generated a long way from where it is used, and is transmitted long distances through power lines. Power companies use step-up transformers to boost the voltage to hundreds of kV before it is transmitted down a power line, reducing the current and minimizing the power lost in transmission lines.

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## Why do factories need a higher voltage?

If instead, the electricity is transmitted at a really high voltage, the current we need to transfer the same amount of energy can be much less and so less energy is wasted as heat. Large factories and electric trains may require 33,000 volts, smaller factories may require 11,000 or 450 volts.

## Why do we increase the voltage in the national grid?

For a given power increasing the voltage reduces the current required and this reduces the energy losses in the cables. You should know why transformers are an essential part of the National Grid. You also need to know why the long distance power lines use a very high p.d. and relatively low current.

## What must an electric current in power lines pass through before it is safe for your homes?

Electric current in power lines must be stepped down before they enter our homes because they carry a very high voltage. The voltage can destroy appliances that have very low voltage. In this regard, a step down transformer is used to achieve this effect.

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## How does increasing the voltage make the National Grid more efficient?

The transfer of electrical energy via the grid is very efficient. When currents in a cable are higher, more energy is dissipated to the surroundings through heating. As high currents waste more energy than low currents, electrical power is transported around the grid at a high voltage and a low current.

## Why is electricity transmitted at high voltages?

We can improve the efficiency of power transmission by reducing the power losses and cost of conductor and equipment required for power transmission. From the above content, power transmission at high voltage can result in a reduction in power loss and conductor cost, hence improve the efficiency of power transmission.

## Why is generation voltage in power plant is low?

Thereby increase in the cost and size of the machine. Low voltage power generation also results in increase in the size of the generator and occupies larger space.

## How does electricity affect the growth of plants?

Incidents of disease and pest infestation were minimal. The effects of electricity on plant cell metabolism processes can also contribute to plant growth and development depending on how its administered, according to a 1985 New York Times article on electricity and plant growth.

## How does electricity get from the power plant to the home?

Homes: Electricity flows into homes through underground cables. Appliances: Electricity flows all round your home to outlets on the wall. When you plug in a television or other appliance, it could be making a very indirect connection to a piece of coal hundreds of miles away!