![]() In the U.S., standard outlet current alternates back-and-forth 60 times per second, or 60 Hertz (60 Hz). ( Why that is the case will be discussed when we talk about how generators work.) This is called alternating current, or AC.īecause the electricity in your wall outlets comes from a generator atĪ power plant, it is AC. Generators naturally produce current that constantly switches direction,īack and forth. (a) How many amps is that? (b) How many electrons per second is that? (c) How much charge flows through the router every minute? SOLUTIONĬurrent can be produced in a variety of ways, but the most common are batteries and generators.īatteries use chemical reactions, and produce current that flows inĪ steady direction. The wireless WiFi network router in my house uses 500 mA of current. (b) How many electrons per second is that? SOLUTIONĤ. Label on my laptop computer says the current it uses is 4.5A. Stating what voltage and current they require (or maximum current). Most electrical or electronic devices have a label on them somewhere, Here's way-cool video of lightning strikes filmed in super slow-motion.ģ. (That's why lightning usually looks flickery.) Each stroke lasts about 30 microseconds. A typical lightning strike is about 40 coulombs of charge, typically consisting of four separate "strokes". If 37 coulombs of charge flows down a wire every 7.5 seconds, what is the current? SOLUTIONĢ. (a) 1 milliamp is one-thousandth of an amp, or in other words, 1 A = 1000 mA.ġ. (a) What is that current, in amps? (b) How many electrons is that, per second?
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