This path is lower in resistance than the surrounding air and charge flows through this channel, creating lightning. Electricity is the flow of charge. The current is the amount of charge that flows through a cross-sectional area in one second. Voltage is the work done per charge. The voltage of lightning varies with certain altitudes and thickness of the bolt. These fluctuating values are caused by the fact that the cloud and earth act as capacitors.
Avoid placing two Forever Stamps on a mail piece for heavier mail. Additional ounces are much cheaper costing only $0.22 per additional ounce rather than $0.49 for one ounce letter.If you add two Forever Stamps to a 2 ounce letter, you would be paying $0.98 for an item that should only cost $0.71.n 2014, the rate increased to $0.49. Customers who purchased Forever Stamps in 2013 at the rate of $0.46 each may still use those stamps to mail their First Class letters today without adding additional postage to the envelope.
And in 2013, for Global Forever stamps :-) Try this search for Global Forever stamps at store.usps.com. One ounce is a business envelope with 5 sheets of typical Xerox paper, or 1 sheet and six 4x6 photos. Leave out 1 sheet or 1 photo to be safe. 3.5 oz means you can't weigh more, but you pay for 4 oz.Limits, all countries: value under $400, size under 6 1/8 x 11 1/2 x 1/4 thick (same envelope limit as domestic).SE BIG ENVELOPES FOR FLATS: Don't try to mail a small envelope that's over 3.5 oz. even if you pay for it. The small envelope will look like a letter, and LETTER service up to 64 oz was dropped on 12May2008, so now there's only big flats.