# Does high resistance mean low current?

## Does high resistance mean low current?

The higher the resistance, the lower the current flow.

How do the power and resistance relate to the current through the resistor?

When power increases, the resistance will also increase keeping current I constant. When Resistance decreases, Power also reduces keeping current I constant.

Why is high resistance useful?

Resistance is another important property that can be measured in electrical systems. The same is true with electricity. Materials with low resistance let electricity flow easily. Materials with higher resistance require more voltage (EMF) to make the electricity flow.

### Why does the current decrease when voltage increases?

The current required to carry a given power decrease when you increase the voltage because the power is the product of the current with the voltage (and power factor).

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What happens to the voltage when you decrease the current?

Assuming the circuit resistance remains constant, a decrease in current will correspond to a decrease in voltage.

Why does power decrease as resistance increases?

The power dissipated in a resistor is given by P = V2/R which means power decreases if resistance increases. Yet this power is also given by P = I2R, which means power increases if resistance increases.

## What is the relationship between power and resistivity in transmission lines?

Now, the more power is being carried, the more is lost. For a given amount of power being transferred, the resistive loss in the transmission line is proportional to the square of the current!

How can we reduce the power loss during high voltage transmission?

The power loss during High Voltage transmission is much lower compared to low voltage transmission. Therefore, it may be stated that we can reduce the power loss by transmitting the same power from a Power Grid to the end substation with High Voltage (power) Transmission.

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What is the advantage of low current over high voltage?

Low current has another advantage: you can use thinner wires. So, if you’re keeping the current low, then for the same amount of power delivered, you’ll want the voltage high (power in watts = EMF in volts multiplied by current in amps). e.g. to halve the current, you’ll need to double your voltage.

### What is the relation between voltage and current in transmission lines?

It may help to think of it as current causing ‘friction/heat’ which is lost on transmission. From the formula P = V I , I = P V . So, if the voltage is high, current becomes low for same power. Now, H = I 2 R T , so lower the current, lower is the heat production.