Trading leverage or leveraged trading allows you to control much larger amounts in a trade, with a minimal deposit in your account. Leveraged trading is also known as margin trading. You can open up a small account with a brokerage, and then essentially borrow money from the broker to open a large position. This allows traders to magnify the amount of profits earned.
Once you begin trading with a certain FX broker, you may want to modify the leverage available to you. This depends on the broker. With Admiral Markets you can use an industry standardised procedure that includes authenticating to the Trader's Room, selecting your account, and changing the leverage available. This action takes immediate effect, so be careful if you have open positions when you attempt to reduce your leverage.
The bottom line is that you want to pick carry trades that benefit not only from a positive and growing yield, but that also have the potential to appreciate in value. This is important because just as currency appreciation can increase the value of your carry trade earnings, currency depreciation can erase all of your carry trade gains – and then some. 
When scalping, traders tend to employ a leverage that starts at 50:1 and may go as high as 500:1. Knowing the effect of leveraging and the optimal leverage Forex trading ratio is vital for a successful trading strategy, as you never want to overtrade, but you always want to be able to squeeze the maximum out of potentially profitable trades. Usually a trader is advised to experiment with leverage within their strategy for a while, in order to find the most suitable one.
Financial leverage is quite different from operating leverage. Operating leverage of a business entity is calculated as a sum total of the amount of fixed costs it bears, whereby the higher the amount of fixed costs, the higher the operating leverage will be. Combine the two and we get the total leverage. So, what does leveraging mean for a business? It is the use of external funds for expansion, startup or asset acquisition. Businesses can also use leveraged equity to raise funds from existing investors.
When a trader decides to trade in the forex market, he or she must first open a margin account with a forex broker. Usually, the amount of leverage provided is either 50:1, 100:1 or 200:1, depending on the broker and the size of the position that the investor is trading. What does this mean? A 50:1 leverage ratio means that the minimum margin requirement for the trader is 1/50 = 2%. A 100:1 ratio means that the trader is required to have at least 1/100 = 1% of the total value of trade available as cash in the trading account, and so on. Standard trading is done on 100,000 units of currency, so for a trade of this size, the leverage provided is usually 50:1 or 100:1. Leverage of 200:1 is usually used for positions of $50,000 or less.
Currencies are traded on the Foreign Exchange market, also known as Forex. This is a decentralized market that spans the globe and is considered the largest by trading volume and the most liquid worldwide. Exchange rates fluctuate continuously due to the ever changing market forces of supply and demand. Forex traders buy a currency pair if they think the exchange rate will rise and sell it if they think the opposite will happen. The Forex market remains open around the world for 24 hours a day with the exception of weekends.