How do I know the wattage of my transformer?

Steps

1. The number of watts is equal to amps multiplied by volts. That’s it!
2. For example, if the current is 3 amps (3A) and the voltage is 110V, you multiply 3 by 110, to get 330W (watts). The formula is P=3A X 110V = 330 W (with P standing for power).
3. This is why watts are sometimes called volt-amps.

How is primary current calculated?

The primary current is equal to the product of the secondary voltage and secondary current divided by primary current. The secondary current is equal to the product of the primary voltage and primary current divided by secondary voltage.

How do you calculate the voltage of a transformer?

Input and output power

1. Electrical power is calculated by multiplying voltage (in volts) by current (in amps).
2. If a transformer is 100\% efficient, then the input power will equal the output power.
3. V P is input (primary) voltage.
4. I p is input (primary) current.
5. V s is output (secondary) voltage.

How do you calculate current in a secondary transformer?

In other words, n1/n2 = i2/i1, where i1 and i2 are the currents through the two coils. Continuing with the above example, if the current through the energized coil is 5 amps, then the current through the secondary coil is 200/100 * 5 = 10 amps.

How do you find the primary voltage of a transformer?

Transformer current calculations: The primary voltage is equal to the product of the secondary voltage and primary current divided by secondary current. The secondary voltage is equal to the product of the primary voltage and primary current divided by secondary current.

How do you find the primary current of a 3 phase transformer?

the following figure presents a nameplate of a three phase transformer….Using the aforementioned formula, let’s confirm this rating:

1. Primary Voltages or High Voltages (H.V) is 11000 volts.
2. Primary Current (current on High Voltage side) is 5.25 amps.
3. KVA = (√3. V x I) /1000= (1.732 × 11000 × 5.25)/1000=100 KVA.