• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Circuit Breakers. A circuit breaker is a device that automatically breaks an electrical circuit whenever the circuit becomes overloaded or an unintentional short circuit occurs.

Extracts from this document...

Introduction

Circuit Breakers

What is circuit breaker?

A circuit breaker is a device that automatically breaks an electrical circuit whenever the circuit becomes overloaded or an unintentional short circuit occurs.  Circuit breakers have a set electric current load capacity which when breached results to automatic circuit shutdown.

Overloading occurs whenever the wires comprising an electrical circuit are forced to carry and conduct an electric charge beyond their capacity. Whenever this happens, the wires heat up. This may result in insulation breakdown (in which a short circuit may occur) or an electrical fire.

An unintentional short circuit occurs when electricity

...read more.

Middle

image01.pngimage02.pngimage01.png

What advantages does a circuit breaker have over the fuse?

Circuit breakers only need to be reset after use whereas a

...read more.

Conclusion

The second type of circuit breaker uses heat to break a circuit. A thermal circuit breaker has a bimetallic strip, which is a strip of material that has two types of metal welded together. The two metals expand with heat but each metal does so at a different rate from the other. Thus, the metal strip bends with the heat generated by the electric current flowing through the circuit. At dangerous heat levels, the strip would be bent at a certain angle that would be enough to pull the circuit breaker's lever down and sever the connection between the circuit breaker's contact plate and the circuit's stationary contact plate

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Electricity and Magnetism essays

  1. Physical - Circuit

    The length of the wire should be measure before the experiment. 3. The temperature of the wire from room temperature to 80�C. 4. The amount of charge flows in the circuit. Fair Test: In this experiment, I would first make sure that the ammeter and the voltmeter were perfectly

  2. Investigating Resistance in an electrical circuit

    If the length of a wire is doubled, the resistance is doubled. Another is the effect of temperature on a conductor. The higher the temperature, the higher the resistance. This is because the hotter the wire becomes the more vibrations make atoms "get in the way" of the electrons more often.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work