What standing wave ratio results from connecting a 50-ohm feed line to a 10-ohm resistive load?

When calculating the Standing Wave Ratio (SWR) for a purely resistive load, you simply find the ratio between the feed line impedance and the load impedance. To get the correct format, always divide the larger impedance value by the smaller one. Here, you divide the 50-ohm feed line impedance by the 10-ohm load (50 / 10 = 5). This makes the SWR exactly 5:1. Answers like 1:5 are incorrect because an SWR is never expressed as a fraction less than 1. SWR describes the ratio of maximum to minimum voltage on the line, which mathematically cannot be less than 1:1.