Gr. 11 phsycs? electromagnetic induction HELP!?

Question

i honestly cant solve this, ive been really frustrated and im looking for an answer that helps me walk through the steph to solve (easy 10 pts) thnks

1) The generator at a hydroelectric facility produces a voltage of 7.50 x 10^2 V. This is stepped up to 6.00 x 10^5 V for transmission to nearest town. At town it's stepped down to 1.5 x 10^4 V at an electrical substation, and then stepped down to 2.40 x 10^2 in your neighbourhood.

If the total current available from the transformer in your area is 6.0 x 10^3 A, find the current that must be transmitted at each step of the journey. (100% efficiency.)

Answer 1

The basic principle you need to understand is that the volt-amps (VA) are constant in all sections of the transmission given your 100% efficiency condition and assuming equal power factors in all sections

The voltage of each section is:

1. 750

2. 600,000.

3. 15,000.

4. 240 with the total current in this last section being 6,000A

The total VA = 240 x 6000 = 1,440,000. therefore the corresponding amps in the other 3 sections are:

1. 1,440,000./ 750 = 1,920.A

2. 1,440,000./ 600,000. = 2.4A

3.  1,440,000./ 15,000. = 96.A

Note - these amp values correspond to the currents required in the 4 transmission sections to supply "your" neighbourhood only.