what is the typical efficiency rating for a power supply course hero

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What is a power rating?

What is the meaning of power rating? Resistor power rating can be defined as the maximum power a resistor can handle safely without any damage. We know that, resistor dissipates the excess energy in form of heat. Power rating indicates the maximum heat a resistor can dissipate safely.

Why is it important to use a power rated resistor?

This is power rating of a resistor.It is very important to use correct power rated resistor in the circuit to prevent the circuit from damaging.

Why are SMD resistors less than grid resistors?

Because of their small size, the power dissipation capacity of SMD resistors is less than grid type resistors and water resistors.

What are power resistors used for?

Applications of Power Resistors. Power resistors are used in applications where we need to dissipate large power. Some of the applications of Power resistors are. Engine brakes in heavy locomotives and trams use power resistors. Locomotives move at high speed and possess high kinetic energy.

How hot can a nichrome resistor withstand?

If Nichrome alloy based wire wound resistors are used with proper non-conductive enamel paint, they can withstand temperatures up to 450 0 C.

How many amps are in a power resistor?

Power resistors are used as grounding resistors to limit fault currents, high voltages and act as protective relays. These resistors can be rated up to 8 Kilo Amps.

How many electrodes are needed for grid resistors?

The construction of Grid Resistors includes two electrodes with large metal stripes connected between them in the form of a matrix.