Standard secondary current ratings are 5 amperes or 1 ampere, compatible with standard measuring instruments. It can supply 15 volts maximum 5 amperes. The ignition system provides initial 50,000 volts and 1.2 amperes. Better protectors exceed ratings of 1,000 joules and 40,000 amperes. This is equal to the product of root-mean-square volts and amperes. Switched shunts are rarely used for currents above 10 amperes. Electric currents are measured in amperes (A), hence the name. Hz, single phase, and typically a few amperes or even less. Iron can have a magnetization of around a million amperes per meter. Combination type AFCIs trip on 5 amperes of series arcing. The total transmission capacity of the company is 16,200 megavolt amperes. Each fuse is printed with the rated current in amperes on the top. A current of about 1800 amperes flows in the global circuit. Showing approximate current (in amperes) necessary to produce a given temperature. The electrical bus is at only 13 to 14 amperes.