In my text book it is written that a step up transformer is used to increase ac voltage and decrease current. but Current is directly proportional to voltage right?
Help me pls.
Answers
Answered by
1
HERE'S YOUR ANSWER DUDE ⬇ ⬇
Transformers only work with AC or transient voltages. They can step the input voltage up or down. The results are based on the ratio of its primary and secondary windings. No transformer operates without loss but let's assume it is perfect for the sake of expressing the concept.
If the number of windings in the primary and secondary are equal, its ratio as 1:1. That's to say if you have a 20VAC input, you'll get 20VAC output. Power remains the same.
If the primary has twice as many windings than the secondary, its ratio is 2:1. It's a step down transformer. That's to say if you have a 20VAC input, you'll get a 10VAC output. Power remains the same.
If the secondary has twice as many windings than the primary, its ratio is 1:2. It's a step up transformer. That's to say if you have a 20VAC input, you'll get a 40VAC output. Power remains the same.
The Power (Watts = Volts x Current) the primary is drawing is roughly equivalent to the power being drawn from the secondary. It can transform the Voltage:Current ratio but it can't create more power. In fact, there is always some loss.
Power doesn't magically appear so if the output voltage increases, then the output current must decrease in order for the power to remain the same. And vica versa.
There are several other quantities and considerations but that's a basic answer to your question. I hope this helped.
Transformers only work with AC or transient voltages. They can step the input voltage up or down. The results are based on the ratio of its primary and secondary windings. No transformer operates without loss but let's assume it is perfect for the sake of expressing the concept.
If the number of windings in the primary and secondary are equal, its ratio as 1:1. That's to say if you have a 20VAC input, you'll get 20VAC output. Power remains the same.
If the primary has twice as many windings than the secondary, its ratio is 2:1. It's a step down transformer. That's to say if you have a 20VAC input, you'll get a 10VAC output. Power remains the same.
If the secondary has twice as many windings than the primary, its ratio is 1:2. It's a step up transformer. That's to say if you have a 20VAC input, you'll get a 40VAC output. Power remains the same.
The Power (Watts = Volts x Current) the primary is drawing is roughly equivalent to the power being drawn from the secondary. It can transform the Voltage:Current ratio but it can't create more power. In fact, there is always some loss.
Power doesn't magically appear so if the output voltage increases, then the output current must decrease in order for the power to remain the same. And vica versa.
There are several other quantities and considerations but that's a basic answer to your question. I hope this helped.
phanihrushik:
Thank you so much.
your welcome dude... Anytime
please mark a brainliest
Answered by
1
Current is directly proportional to voltage only when the physical quantities like temperature is constant (ohms law)
Step up transformer is used to increase voltage so that the current is slowed therefore there is no loss of energy from relation p=vi where p is power
I=p/v there fore higher the voltage lower the current that's why these transformer is used in power substation so that loss of energy due to heat is prevented and the current is transmitted
Thank you so much
Aa bhos dk mughko kyu Nahi bhanaya brainliest
Similar questions