An AC adaptor for a telephone answering unit uses a transformer to reduce the line voltage of 238 V (rms) to a voltage 7.5 V. The rms current delivered to an answering system is 345 mA. If the primary (input) coil in the transformer in the adaptor has 260 turns, how many turns are there on the secondary (output) coil

“other instruments such as gravimeters and magnetometers are also used in the search for petroleum. extracting crude oil normally starts with drilling wells into an underground reservoir. when an oil well has been tapped, a geologist (known on the rig as the "mudlogger") will note its presence. “ this is what i found on google i hope it