They usually just measure current used and assume a known voltage.
Usually
Usually electrical panels are metallic enclosures that house electrical components. An electrical home panel contains the house's circuit breakers. An electrical control panel contains electrical controls such as relays that usually control other pieces of machinery or motors.
Alternating electrical current is usually used in household.
Usually electrical energy is transformed into mechanical or kinetic energy
It depends which car it is, electrical cars are usually more expensive.
The ships have their own electrical generation capabilities, usually combined with their diesel-electric engines.
You usually charge an electric shaver by plugging it in to an electrical outlet. Some shavers run on line power and are not built to be charged; they will not work if not plugged it.
In an electric circuit, potential energy is usually understood as "stored charge." This is what capacitors do.
The international unit for energy is the joule, equal to the watt-second. Electric meters, however, are usually calibrated to measure kilowatt-hours (equal to 3.6 million watt-seconds).
the sending of electrical current into the water shocks the fish and brings them to the surface usually done by the fish and game department.
I assume you are referring to energy conversions. Well, the whole PURPOSE of an electric iron is to produce heat, and being electric means that it uses electrical energy, so the conversion is, simply, from electrical energy to heat.
Electric contractors are expensive because they are highly skilled technicians who are familiar with electronics and electrical systems. Electric contractors usually go through vocational training and/or apprenticeships which add to their skill levels.