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My RF Ammeters


nfsus

Yeah its turned off, touch it
May 9, 2011
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Arkansas
Kool boxing. Looks very slick. So how many amps make a watt? What? A watt? Yeah a what. No a watt. Huh


How many watts can you run through a 10amp relay? Hf freq range
 

DTB Radio

Well-Known Member
Sep 14, 2005
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Carlisle, PA. USA
www.dtbradio.com
Kool boxing. Looks very slick. So how many amps make a watt? What? A watt? Yeah a what. No a watt. Huh


How many watts can you run through a 10amp relay? Hf freq range

Ohms law for power when current and resistance are known is Power = Current squared times Resistance. Assuming the 10-amp current is through a 50-ohm load, we then get Power = 10 * 10 * 50 = 5000 watts. Someone please correct me if I'm wrong.
 
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brandon7861

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Nov 28, 2018
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Ohms law for power when current and resistance are known is Power = Current squared times Resistance. Assuming the 10-amp current is through a 50-ohm load, we then get Power = 10 * 10 * 50 = 5000 watts. Someone please correct me if I'm wrong.
...and 5kW/10A=500v RMS or 1415V peak-peak (and twice that if you have a high SWR). This is why relays have voltage ratings! Even if nothing arced over, it can still melt passing 5kW. They have a specific VA rating in mind when they manufacture them, it's not just the current.
 

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