Watts on the other hand is directly related to the power that water could provide. For example, it could be powering a water wheel. Every circuit breaker has a specified amperage amount of current. This rating is labeled on the breaker itself. The standard for most household circuits are rated either 15 amps or 20 amps.
That means a amp circuit breaker can handle around amps and a amp circuit breaker can handle about 16 amps. Your circuit breaker is an essential part in the safety of your home or building. It keeps your electrical wiring system from overheating. What are some common reasons for a circuit breaker to trip? These are just a few ways to troubleshoot a tripped breaker. Depending on the problem, some issues can be tackled at home while others will need the help of a qualified electrician.
Other protection schemes have wider tolerances that allow the load to significantly exceed the maximum rated output. Threshold differences between individual supplies can cause issues if the protection is enabled in some supplies but not in others. If the output does not shut down, the supply will operate above its maximum current resulting in spec related issues or failure. In addition, more complex power supplies offer protection against current falling below the minimum rating while others will disable operation completely under these conditions.
Power supplies that cannot reliably regulate themselves at light loads will lead to excessive voltage on the output which could also trigger a protection. With increased output current comes similar increases in component currents throughout the power train. Components such as MOSFETs, diodes, resistors, and even copper traces will see increased power dissipation and heat because of the increased current. Diodes and other components with a fixed voltage, will observe a linear increase in power dissipation, while MOSFETs and components with resistive elements will show an exponential rise in power dissipation with respect to load increases.
In both cases this will lead to increased temperature rise, reduced reliability, and increased risk of failure. Magnetic components such as chokes and transformers, while experiencing increased conduction losses like the previous components, may also encounter increased core loss and be pushed into saturation, producing further losses and heat generation. Saturated magnetics could also cause the power supply to cease functioning or generate increased currents in other components, such as the MOSFETs and diodes.
For example, in a buck converter, the ripple current is directly related to the inductance. In addition to discrete magnetic components, there are also parasitic inductances, such as the leakage inductance of the transformer.
These parasitic components cause voltage spikes when the switch changes state and the magnitude of this spike increases with load. In the case of the transformer leakage, the voltage spike is applied across the MOSFET and may cause it to fail if too large. Other components, like those that sense voltages and currents, will sense these voltage spikes which will result in the controller receiving incorrect voltage and current information — leading to poor performance or failure.
Power, size and cost are all important factors when choosing a power supply. Even so, users will often try to force all three factors opening themselves up to potential problems. The output current is one such area that affects just about every component in the power supply.
Some effects are obvious while others are easily overlooked and cause immediate or long-term issues. Before operating outside of the output current rating of a power supply the user should consult with the power supply manufacturer to understand the risks of doing so or to seek out an alternative solution.
Have comments regarding this post or topics that you would like to see us cover in the future? Send us an email at powerblog cui. Visit Other Worlds Today! What is an MCB and how does it work? A Miniature Circuit Breaker is an electromechanical device designed to protect an electric circuit from over-current - A term to describe an electrical fault caused by either overload or short circuit.
Back in the day we protected against over-current by using fuse wire indeed, we used to sell it! The principle was fairly simple - an over-current would quite literally, 'blow' the fuse wire by rapidly heating and melting it, thus breaking the electrical connection and in doing so, protected the rest of the electrical circuit. MCBs improve on this functionality as they are usually not destroyed during over-current so are reusable. It is important to note that MCBs do not protect humans against electrical shock caused by 'earth leakage'.
An MCB has three principle characteristics, Amperes, Kilo Amperes and Tripping Curve Overload Current Rating - Amperes A Overload occurs when too many appliances are put on one circuit and draw more electrical current than that circuit and cable are designed to take. This could occur in the kitchen, for example when the kettle, dishwasher, electric hob, microwave and blender are all in use simultaneously. The MCB on this circuit cuts power thus preventing overheating and fire in the cable and terminals.
Short Circuit Rating - Kilo Amperes kA Short Circuit is the result of a fault somewhere in the electrical circuit or appliance and is potentially much more dangerous than overload as the scale and speed of over current is in a different order of magnitude. It occurs when there is a direct connection between the live and neutral conductors. More specifically, using a light bulb with a higher wattage than you are supposed to can is dangerous and could be a safety hazard in your home.
Let a Trusted Electrician Explain. Most of the times when people have problems with buying the wrong light bulb, it is because they bought a light bulb with a higher wattage than they were supposed to. The watt rating on your light socket usually states the maximum wattage.
In other words, replacing your light bulb with a lower wattage should not be an issue; however, replacing it with higher wattage could potentially lead to overlamping - a safety hazard for your home.
Fixtures have a manufacturer-recommended wattage rating that you need to follow, and if you exceed it, intense heat is the result. Overlamping can lead to a number of problems, and the longer the overlamping occurs, the more you put yourself and your home at risk. Using a light bulb with too high of wattage can lead to overheating of the light bulb. This heat can melt the light socket as well as the insulation of the wires.
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