Question

The power delivered to an antenna properly matched to an transmission line is found by the formula P=I^(2)R, where R is the resistance of the antenna and I is the r-f current. If the power delivered to the antenna is 15000 W and the antenna has a resistance of 32 ohm's, what is the value of r-f current flowing to the antenna? 1) 468.8A 2) 216.5A 3)68.47A 4)46.88A 5)21.65A 6)692.8A

Answer 1

plug in what you know
P = 15,000
R = 32

15,000 = 32*I^2
divide by 32 on both sides
468.75 = I^2
take square root of both sides
21.65 = I

Answer 2

You could rearrange your formula to make it easier: \[P=I^2R\]\[I=\pm\sqrt{\frac{P}{R}}\]

Answer 3

thankx eyou guys