Electrical Resistance Electrician Altrincham

Electrical Resistance Electrician Altrincham

This web page describes – electrical resistance electrician altrincham

What electrical resistance is, how electrical resistance is used in a domestic electrical circuit and a description of the problems too much, or too little, electrical resistance can cause.

 

What Is ‘Electrical Resistance’

Electrical resistance is a measure of the opposition to the flow of electrical current.

 

A piece of wire has very low electrical resistance – rubber insulation has a very high electrical resistance.

 

How Is Electrical Resistance Is Used In Domestic Electrical Circuits?

Domestic electrical circuits use materials with low electrical resistance where they want electricity to flow and materials with high electrical resistance where they don’t want electricity to flow.

 

  • Power leads have low electrical resistance as we want electricity to flow along electrical power leads.
  • Fuses have low electrical resistance as we want electricity to flow through a fuse.
  • Electrical insulation has high electrical resistance as we don’t want electricity to flow along electrical insulation.
  • The casing of electrical plugs have high electrical resistance as we don’t want electricity to flow in the casing of a plug.

Electrical resistance does not have to be very high or very low, electrical resistance can be any value. Electrical resistance can be used to:

  • Control the voltage in or to an electrical appliance – varying the resistance varies the voltage to one part of the circuit.
    • The volume control on a radio varies the voltage to the amplifier – adjust the volume control (adjust the voltage) to adjust the volume.
    • A lights dimmer switch works by varying the voltage to a bulb.

Problems Caused By Electrical Resistance

Electrical resistance is a problem when:

  • There is electrical resistance where electrical resistance is not expected, for instance:
    • Damaged power leads – the increased electrical resistance causes the lead to heat up and cause a fire.
    • Electrical appliances stop working because the unexpected electrical resistance uses up some of the voltage meant for the electrical appliance.
    • Electrical appliances do not work as the switch is ‘open circuit’ (very high resistance).
    • Electrical appliances do not work as the fuse has blown (very high resistance).
  • There is no electrical resistance where electrical resistance is expected, for instance:
    • A kettle casing ‘becomes live’ as the electrical resistance between the kettle supply and the kettle casing is too low.
    • An RCD trips as the electrical resistance between a domestic supply and earth is too low.
    • A fuse keeps blowing as there is too little resistance between the supply and the earth lines.

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