Always remember..."electricity is heat". 1-20 amp breaker means just that.It will allow 20 amps of current to flow through it..anymore than 20 amps,and it will reset...look at the information data plates located on all your electrical devices..it should tell you how many amps each electrical device is rated for...You don't want to overload a 20 amp breaker with 30 amps of electrical devices....too much electricity traveling on a wire designed for a 20 amp circuit is bad because the"heat" will cause your electrical wires to melt...thus creating a fire...