Monday, September 9, 2013

Voltmeter/Ammeter Measurements..WHAT YOU WILL LEARN....for your philippine electrical concerns...needs...installation...orders...safeelectrical2013@gmail.com

Voltmeter/Ammeter Measurements

The value of electrical resistance associated with a circuit element or appliance can be determined by measuring the voltage across it with avoltmeter and the current through it with an ammeter and then dividing the measured voltage by the current. This is an application of Ohm's law, but this method works even for non-ohmic resistances where the resistance might depend upon the current. At least in those cases it gives you the effective resistance in ohms under that specific combination of voltage and current.

Voltage Law....WHAT YOU WILL LEARN....for your philippine electrical concerns...needs...installation...orders...safeelectrical2013@gmail.com

Voltage Law

The voltage changes around any closed loop must sum to zero. No matter what path you take through an electric circuit, if you return to your starting point you must measure the same voltage, constraining the net change around the loop to be zero. Since voltage is electric potential energy per unit charge, the voltage law can be seen to be a consequence of conservation of energy.

The voltage law has great practical utility in the analysis of electric circuits. It is used in conjunction with the current law in many circuit analysis tasks.

The voltage law is one of the main tools for the analysis of electric circuits, along with Ohm's Law, the current law and the power relationship. Applying the voltage law to the above circuits along with Ohm's law and the rules forcombining resistors gives the numbers shown below. The determining of the voltages and currents associated with a particular circuit along with the power allows you to completely describe the electrical state of a direct current circuit.

Current law

Resistor combinations

Analogy in water circuit

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Monday, September 9, 2013