What device changes electricity from high voltage with low amps to low voltage with high amps?

Answer 1

A transformer,

: By appropriate selection of the numbers of turns, a transformer thus allows an alternating voltage to be stepped up - by making NS more than NP - or stepped down, by making it less.

Transformers are some of the most efficient electrical 'machines,with some large units able to transfer 99.75% of their input power to their output,Transformers come in a range of sizes from a thumbnail-sized coupling transformer hidden inside a stage microphone to huge units weighing hundreds of tons used to interconnect portions of national power grids. All operate with the same basic principles, although the range of designs is wide.

Answer 2

Transmission voltages are gradually reduced at substations located near 'load centres' (e.g. cities, towns, etc.), using devices called 'transformers'. For example, in the UK the highest transmission voltage is 400 kV. This is gradually reduced through through the electricity supply network, through 275 kV, 132 kV, 33 kV, and eventually to 11 kV. Homes are then supplied by distribution transformers which step down the 11 kV to 230 V (240/120 V in North America).

A transformer is an electrical device (technically called a 'machine', although there are no moving parts) which consists of an silicon-steel core, around which are wound two coils, called 'windings'. One winding, called the 'primary winding', is connected to the supply voltage, and the other winding, the 'secondary winding', is connected to the load (e.g. your home) -if the secondary winding has less turns than the primary winding, then the transformer is a 'step-down' transformer, and will reduce the voltage applied to it.

Answer 3

stepdown transformer