There exist three basic electrical units in any electrical circuit : ampere , ohm and volt .
The ampere is an electrical unit for measuring the strength of electric current in a circuit . One ampere represents the amount of current generated by 1 volt acting through the resistance of 1 ohm . For measuring the intendity of an electric current in amperes a device called ammeter is used .
The ohm is an electrical unit for measuring the resistance or opposition to the flow of current . All substances show different resistances to the flow of electricity through them . With the increase in the temperature the resistance of all metals increases while the resistance of carbon , insulating materials , (electrolytic) solution decreases . One ohm represents such a resistance that a one-volt addition to the potential produces 1 ampere of current . The device used for measuring resistance is called ohmmeter . The most commonly used device for measuring insulation resistance is megohmmeter or "megger" . It is usually employed for continuity , ground and short-circuit testing in general electrical power work .
The volt is an electrical unit measuring the external applied to a circuit to overcome the opposition to flow of current . This force is called voltage and is also raferred to as electromotive force or electric pressure . The electromotive force that causes a current of 1 ampere to flow through a resistance of 1 ohm equals 1 volt . The device used for measuring voltage is called voltmeter .
One more important unit of electrical measurement is the watt - the unit of power : the power of 1 ampere of current pushed by one volt of electromotive force . Devices used for measuring delivery of electric energy in watts are called wattmeter and watthourmeter .
The ampere is an electrical unit for measuring the strength of electric current in a circuit . One ampere represents the amount of current generated by 1 volt acting through the resistance of 1 ohm . For measuring the intendity of an electric current in amperes a device called ammeter is used .
The ohm is an electrical unit for measuring the resistance or opposition to the flow of current . All substances show different resistances to the flow of electricity through them . With the increase in the temperature the resistance of all metals increases while the resistance of carbon , insulating materials , (electrolytic) solution decreases . One ohm represents such a resistance that a one-volt addition to the potential produces 1 ampere of current . The device used for measuring resistance is called ohmmeter . The most commonly used device for measuring insulation resistance is megohmmeter or "megger" . It is usually employed for continuity , ground and short-circuit testing in general electrical power work .
The volt is an electrical unit measuring the external applied to a circuit to overcome the opposition to flow of current . This force is called voltage and is also raferred to as electromotive force or electric pressure . The electromotive force that causes a current of 1 ampere to flow through a resistance of 1 ohm equals 1 volt . The device used for measuring voltage is called voltmeter .
One more important unit of electrical measurement is the watt - the unit of power : the power of 1 ampere of current pushed by one volt of electromotive force . Devices used for measuring delivery of electric energy in watts are called wattmeter and watthourmeter .
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