Running agarose gel electrophoresis voltage and current separation is obvious is normal. 1% agarose is commonly used as electrophoretic support. Agarose gel can distinguish about the difference of 100bp DNA fragments, its resolution, although lower than polyacrylamide gel, easy to prepare, wide range of separation. Ordinary agarose gel separates DNA in the range of 0.2-20kb, and using pulsed electrophoresis, DNA fragments of up to 10^7bp can be separated.