What is the importance of resistance in a electricity?

Resistance causes some of the electrical energy to turn into heat so some electrical energy is lost along the way. However, it is resistance that allows us to use electricity for heat and light. The heat that is generated from electric heaters or the light that we get from light bulbs is due to resistance.

What is the main role of resistance?

resistance, in electricity, property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current.

What does electrical resistance tell us?

The electrical resistance of an electrical conductor is a measure of the difficulty of passing an electric current through a substance. It explains the relationship between voltage (amount of electrical pressure) and the current (flow of electricity).

What factors affect electrical resistance?

There are several factors that affect the resistance of a conductor;

• material, eg copper, has lower resistance than steel.
• length – longer wires have greater resistance.
• thickness – smaller diameter wires have greater resistance.
• temperature – heating a wire increases its resistance.

How does electrical resistance arise in metal conductors?

Resistance is due to the collision of free electrons with the metal ions of the conductor. When the temperture increases, the metal ions have more energy and vibrate. This increases the frequency of collisions between free electrons and the metal ions, and therefore increasing the resistance.

What is electrical resistance simple words?

The electrical resistance of an electrical conductor is a measure of the difficulty of passing an electric current through a substance. With more resistance in a circuit, less electricity will flow through the circuit. The inverse of resistance is conductance, a measure not much used.

What is electrical resistance of an object?

The electrical resistance of an object is a measure of its opposition to the flow of electric current. Its reciprocal quantity is electrical conductance, measuring the ease with which an electric current passes. For example, a wire’s resistance is higher if it is long and thin, and lower if it is short and thick.

What is a electrical resistance?

Resistance is a measure of the opposition to current flow in an electrical circuit. Resistance is measured in ohms, symbolized by the Greek letter omega (Ω).

What are the important factors affecting the electrical resistance of engineering materials?

There are four factors affecting resistance which are Temperature, Length of wire, Area of the cross-section of the wire, and nature of the material. When there is current in a conductive material, the free electrons move through the material and occasionally collide with atoms.

Why does resistance decrease as current increases?

This is like plugging more globes into a circuit, as the resistance increases, the current decreases. In this case, there is a inverse relationship between the two variables. As the resistance increases, the current decreases, provided all other factors are kept constant.

Where is electric resistance used?

So, a bulb has a Tungsten filament through which current is passes, due to its high resistance, heat is produced and it starts glowing. This is how resistance is used in an Electric Bulb.

What is electrical resistance?

Electrical resistance is analogous to friction in a mechanical system. They both convert energy to heat and dissipate it to the surrounding environment, so electrical resistance can sometimes be thought of as a braking or damping mechanism in a circuit.

Why are resistors important in electrical circuits?

They may be small and often built-in to other components, but resistors are essential to almost every electrical circuit. These hidden resistors are essential because they control the flow of the electrical current to sensitive components, and they protect components from voltage spikes.

How do you increase the resistance of a series circuit?

Changing the resistance If you increase the number of lamps in a series circuit, there will be less current. The lamps resist the current, so if you put more lamps into the circuit, there is more resistance. You could do the same with a variable resistor.

What is the importance of resistance in heating elements?

When an electric current flows through them, they get hot enough to boil your water or cook your bread. In heating elements, at least, resistance is far from useless. Resistance is also useful in things like transistor radios and TV sets. Suppose you want to lower the volume on your TV.