A resistor is connected across an oscillating emf with a peak current through the resistor of 6.00 A. If the resistance R is doubled, what is the peak current?

**Answer 1**

If the source has zero impedance ( ie is an ideal supply)

then at any instant of time V = I r

I = v/r

as v has not altered then I is inversely proportional to r

so double r and you halve I