1 Answer
The apparent power in a transformer is called "apparent" because it represents the total power flowing through the system, combining both real power (useful power) and reactive power (power that does no useful work but is necessary to maintain magnetic fields in inductive loads like transformers).
In simpler terms, transformers deal with both types of power:
Now, the apparent power (S) is a combination of these two:
\[
S = \sqrt{P^2 + Q^2}
\]
Apparent power is measured in volt-amperes (VA) and represents the total power, both used and unused, flowing through the transformer.
Why do we use "apparent" power?
Because in the case of transformers, even though not all of it is "real" power that performs work, it is still part of the total energy flow in the system. So, apparent power helps us account for both the energy used in work and the energy needed to maintain the system’s operation.
In simpler terms, transformers deal with both types of power:
- Real Power (Active Power, \( P \)): This is the power that actually performs useful work. In transformers, real power is what is transferred to the load (e.g., motors, lights).
- Reactive Power (Q): This power doesn't perform any useful work but is needed to create and maintain the magnetic field inside the transformer. Without this, the transformer wouldn't function properly.
Now, the apparent power (S) is a combination of these two:
\[
S = \sqrt{P^2 + Q^2}
\]
Apparent power is measured in volt-amperes (VA) and represents the total power, both used and unused, flowing through the transformer.
Why do we use "apparent" power?
Because in the case of transformers, even though not all of it is "real" power that performs work, it is still part of the total energy flow in the system. So, apparent power helps us account for both the energy used in work and the energy needed to maintain the system’s operation.